diff --git a/scripts/langindex.json b/scripts/langindex.json
index 07dfc6c83..65bdc325e 100644
--- a/scripts/langindex.json
+++ b/scripts/langindex.json
@@ -2396,6 +2396,8 @@
   "core.user.sendemail": "local_moodlemobileapp",
   "core.user.student": "moodle/defaultcoursestudent",
   "core.user.support": "local_moodlemobileapp",
+  "core.user.supportmessagesent": "user",
+  "core.user.supportsubject": "local_moodlemobileapp",
   "core.user.teacher": "moodle/noneditingteacher",
   "core.user.useraccount": "moodle",
   "core.user.userwithid": "local_moodlemobileapp",
diff --git a/src/core/components/error-info/error-info.scss b/src/core/components/error-info/error-info.scss
index 784457cf1..97922518f 100644
--- a/src/core/components/error-info/error-info.scss
+++ b/src/core/components/error-info/error-info.scss
@@ -12,24 +12,22 @@
         margin-bottom: 0;
     }
 
-    .core-error-info--content {
+    .core-error-info--code {
         padding: var(--spacing-2) var(--spacing-2) 0 var(--spacing-2);
+        font-size: var(--font-size-normal);
+    }
 
-        .core-error-info--code {
-            font-size: var(--font-size-normal);
-        }
-
-        .core-error-info--details {
-            color: var(--gray-500);
-        }
-
+    .core-error-info--details p {
+        padding: var(--spacing-2) var(--spacing-2) 0 var(--spacing-2);
+        color: var(--gray-500);
     }
 
     .core-error-info--checkbox {
         display: none;
 
-        & + .core-error-info--content {
-            max-height: calc(var(--font-size-sm) + 2 * var(--spacing-2));
+        & + .core-error-info--details,
+        & + .core-error-info--code + .core-error-info--details {
+            max-height: 0;
             overflow: hidden;
             transition: max-height 600ms ease-in-out;
 
@@ -58,8 +56,9 @@
 
         }
 
-        &:checked + .core-error-info--content {
-            max-height: 150px;
+        &:checked + .core-error-info--details,
+        &:checked + .core-error-info--code + .core-error-info--details {
+            max-height: 110px;
 
             & + .core-error-info--toggle .core-error-info--hide-content {
                 display: flex;
@@ -73,16 +72,4 @@
 
     }
 
-    &.has-error-code .core-error-info--checkbox {
-
-        & + .core-error-info--content {
-            max-height: calc(var(--font-size-normal) + 2 * var(--spacing-2));
-        }
-
-        &:checked + .core-error-info--content {
-            max-height: 170px;
-        }
-
-    }
-
 }
diff --git a/src/core/components/error-info/error-info.ts b/src/core/components/error-info/error-info.ts
index 6584653d9..948d27eb1 100644
--- a/src/core/components/error-info/error-info.ts
+++ b/src/core/components/error-info/error-info.ts
@@ -40,16 +40,16 @@ export class CoreErrorInfoComponent implements OnInit, OnChanges {
      */
     static render(errorDetails: string, errorCode?: string): string {
         const toggleId = CoreForms.uniqueId('error-info-toggle');
-        const errorCodeLabel = Translate.instant('core.errorcode');
+        const errorCodeLabel = Translate.instant('core.errorcode', { errorCode });
         const hideDetailsLabel = Translate.instant('core.errordetailshide');
         const showDetailsLabel = Translate.instant('core.errordetailsshow');
 
         return `
-            <div class="core-error-info ${errorCode ? 'has-error-code' : ''}">
+            <div class="core-error-info">
                 <input id="${toggleId}" type="checkbox" class="core-error-info--checkbox" />
-                <div class="core-error-info--content">
-                    ${errorCode ? `<p class="core-error-info--code"><strong>${errorCodeLabel}: ${errorCode}</strong></p>` : ''}
-                    <p class="core-error-info--details">${errorDetails}</p>
+                ${errorCode ? `<div class="core-error-info--code"><strong>${errorCodeLabel}</strong></div>` : ''}
+                <div class="core-error-info--details">
+                    <p>${errorDetails}</p>
                 </div>
                 <label for="${toggleId}" class="core-error-info--toggle" aria-hidden="true">
                     <span class="core-error-info--hide-content">
diff --git a/src/core/features/user/classes/support/authenticated-support-config.ts b/src/core/features/user/classes/support/authenticated-support-config.ts
index 36b87a446..361b82b54 100644
--- a/src/core/features/user/classes/support/authenticated-support-config.ts
+++ b/src/core/features/user/classes/support/authenticated-support-config.ts
@@ -66,6 +66,13 @@ export class CoreUserAuthenticatedSupportConfig extends CoreUserSupportConfig {
         return false;
     }
 
+    /**
+     * @inheritdoc
+     */
+    getSupportPageLang(): string | null {
+        return this.site.infos?.lang ?? null;
+    }
+
     /**
      * @inheritdoc
      */
diff --git a/src/core/features/user/classes/support/guest-support-config.ts b/src/core/features/user/classes/support/guest-support-config.ts
index 2c4462478..4861bf4ca 100644
--- a/src/core/features/user/classes/support/guest-support-config.ts
+++ b/src/core/features/user/classes/support/guest-support-config.ts
@@ -13,6 +13,7 @@
 // limitations under the License.
 
 import { CoreSiteConfigSupportAvailability, CoreSitePublicConfigResponse } from '@classes/site';
+import { CoreLoginHelper } from '@features/login/services/login-helper';
 import { CoreUserNullSupportConfig } from '@features/user/classes/support/null-support-config';
 import { CoreSites } from '@services/sites';
 import { CoreUtils } from '@services/utils/utils';
@@ -51,6 +52,10 @@ export class CoreUserGuestSupportConfig extends CoreUserSupportConfig {
      * @inheritdoc
      */
     canContactSupport(): boolean {
+        if (CoreLoginHelper.isFeatureDisabled('NoDelegate_CoreUserSupport', this.config)) {
+            return false;
+        }
+
         // This config was introduced in 4.1, if it's missing we can assume the site is 4.0 or lower.
         if ('supportavailability' in this.config) {
             return this.config.supportavailability === CoreSiteConfigSupportAvailability.Anyone;
@@ -60,6 +65,13 @@ export class CoreUserGuestSupportConfig extends CoreUserSupportConfig {
         return 'supportpage' in this.config;
     }
 
+    /**
+     * @inheritdoc
+     */
+    getSupportPageLang(): string | null {
+        return this.config.lang ?? null;
+    }
+
     /**
      * @inheritdoc
      */
diff --git a/src/core/features/user/classes/support/null-support-config.ts b/src/core/features/user/classes/support/null-support-config.ts
index cfdc6d5c4..c152aa301 100644
--- a/src/core/features/user/classes/support/null-support-config.ts
+++ b/src/core/features/user/classes/support/null-support-config.ts
@@ -29,6 +29,13 @@ export class CoreUserNullSupportConfig extends CoreUserSupportConfig {
         return false;
     }
 
+    /**
+     * @inheritdoc
+     */
+    getSupportPageLang(): string | null {
+        return null;
+    }
+
     /**
      * @inheritdoc
      */
diff --git a/src/core/features/user/classes/support/support-config.ts b/src/core/features/user/classes/support/support-config.ts
index 093d6069e..09df13244 100644
--- a/src/core/features/user/classes/support/support-config.ts
+++ b/src/core/features/user/classes/support/support-config.ts
@@ -24,6 +24,13 @@ export abstract class CoreUserSupportConfig {
      */
     public abstract canContactSupport(): boolean;
 
+    /**
+     * Get language used in the support page, if any.
+     *
+     * @return Support page language.
+     */
+    public abstract getSupportPageLang(): string | null;
+
     /**
      * Get url to use for contacting support.
      *
diff --git a/src/core/features/user/lang.json b/src/core/features/user/lang.json
index ed6261dc1..5be59a0aa 100644
--- a/src/core/features/user/lang.json
+++ b/src/core/features/user/lang.json
@@ -31,6 +31,8 @@
     "sendemail": "Email",
     "student": "Student",
     "support": "Contact site support",
+    "supportmessagesent": "Your message has been sent.",
+    "supportsubject": "[App] {{subject}}",
     "teacher": "Non-editing teacher",
     "userwithid": "User with ID {{id}}",
     "webpage": "Web page"
diff --git a/src/core/features/user/services/support.ts b/src/core/features/user/services/support.ts
index 9dbc745a9..72c6cb84e 100644
--- a/src/core/features/user/services/support.ts
+++ b/src/core/features/user/services/support.ts
@@ -24,6 +24,7 @@ import { CoreEvents } from '@singletons/events';
 import { CoreSubscriptions } from '@singletons/subscriptions';
 import { AlertButton } from '@ionic/angular';
 import { CoreDomUtils } from '@services/utils/dom';
+import { CoreLang } from '@services/lang';
 
 /**
  * Handle site support.
@@ -44,6 +45,7 @@ export class CoreUserSupportService {
 
         if (supportPageUrl.endsWith('/user/contactsitesupport.php')) {
             this.populateSupportForm(browser, options.subject, options.message);
+            this.listenSupportFormSubmission(browser, supportConfig.getSupportPageLang());
         }
 
         await CoreEvents.waitUntil(CoreEvents.IAB_EXIT);
@@ -90,6 +92,10 @@ export class CoreUserSupportService {
             return;
         }
 
+        if (subject) {
+            subject = Translate.instant('core.user.supportsubject', { subject });
+        }
+
         const unsubscribe = CoreSubscriptions.once(browser.on('loadstop'), () => {
             browser.executeScript({
                 code: `
@@ -102,6 +108,37 @@ export class CoreUserSupportService {
         CoreEvents.once(CoreEvents.IAB_EXIT, () => unsubscribe());
     }
 
+    /**
+     * Set up listeners to close the browser when the contact form has been submitted.
+     *
+     * @param browser In App browser.
+     * @param lang Language used in the support page.
+     */
+    protected async listenSupportFormSubmission(browser: InAppBrowserObject, lang: string | null): Promise<void> {
+        const appSuccessMessage = Translate.instant('core.user.supportmessagesent');
+        const lmsSuccessMessage = lang && await CoreLang.getMessage('core.user.supportmessagesent', lang);
+        const subscription = browser.on('loadstop').subscribe(async () => {
+            const result = await browser.executeScript({
+                code: `
+                    [...document.querySelectorAll('.alert-success')].some(
+                        div =>
+                            div.textContent?.includes(${JSON.stringify(lmsSuccessMessage)}) ||
+                            div.textContent?.includes(${JSON.stringify(appSuccessMessage)})
+                    )
+                `,
+            });
+
+            if (!Array.isArray(result) || result[0] !== true) {
+                return;
+            }
+
+            browser.close();
+            CoreDomUtils.showAlert(undefined, appSuccessMessage);
+        });
+
+        CoreEvents.once(CoreEvents.IAB_EXIT, () => subscription.unsubscribe());
+    }
+
 }
 
 export const CoreUserSupport = makeSingleton(CoreUserSupportService);
diff --git a/src/core/lang.json b/src/core/lang.json
index 7aa508411..c87f175ed 100644
--- a/src/core/lang.json
+++ b/src/core/lang.json
@@ -102,7 +102,7 @@
     "endonesteptour": "Got it",
     "error": "Error",
     "errorchangecompletion": "An error occurred while changing the completion status. Please try again.",
-    "errorcode": "Error code",
+    "errorcode": "Error code: {{errorCode}}",
     "errordeletefile": "Error deleting the file. Please try again.",
     "errordetailshide": "Hide error details",
     "errordetailsshow": "Show error details",
diff --git a/src/core/services/lang.ts b/src/core/services/lang.ts
index 2773d8d48..15c2730b3 100644
--- a/src/core/services/lang.ts
+++ b/src/core/services/lang.ts
@@ -119,6 +119,33 @@ export class CoreLangProvider {
         return value.charAt(0).toUpperCase() + value.slice(1);
     }
 
+    /**
+     * Get message for the given language.
+     *
+     * @param key Message key.
+     * @param lang Language.
+     * @returns Message if found, null otherwise.
+     */
+    async getMessage(key: string, lang: string): Promise<string | null>  {
+        const messages = await this.getMessages(lang);
+
+        return messages[key] ?? null;
+    }
+
+    /**
+     * Get messages for the given language.
+     *
+     * @param lang Language.
+     * @returns Messages.
+     */
+    getMessages(lang: string): Promise<Record<string, string>> {
+        return new Promise(resolve => CoreSubscriptions.once(
+            Translate.getTranslation(lang),
+            messages => resolve(messages),
+            () => resolve({}),
+        ));
+    }
+
     /**
      * Get the parent language defined on the language strings.
      *