diff --git a/changelog.d/4855.bugfix b/changelog.d/4855.bugfix
new file mode 100644
index 0000000000..d85feb42e7
--- /dev/null
+++ b/changelog.d/4855.bugfix
@@ -0,0 +1 @@
+Fix: Allow users to sign out even if the sign out request fails.
diff --git a/library/ui-strings/src/main/res/values/strings.xml b/library/ui-strings/src/main/res/values/strings.xml
index 8ad9ad6eb4..ee7d2fea12 100644
--- a/library/ui-strings/src/main/res/values/strings.xml
+++ b/library/ui-strings/src/main/res/values/strings.xml
@@ -328,6 +328,9 @@
     <string name="backup">Back up</string>
     <string name="sign_out_bottom_sheet_will_lose_secure_messages">You’ll lose access to your encrypted messages unless you back up your keys before signing out.</string>
 
+    <string name="sign_out_failed_dialog_message">Cannot reach the homeserver. If you sign out anyway, this device will not be erased from your device list, you may want to remove it using another client.</string>
+    <string name="sign_out_anyway">Sign out anyway</string>
+
     <!-- splash screen accessibility -->
     <string name="loading">Loading…</string>
 
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/signout/SignOutService.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/signout/SignOutService.kt
index d64b2e6e92..fade51600a 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/signout/SignOutService.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/signout/SignOutService.kt
@@ -37,6 +37,7 @@ interface SignOutService {
     /**
      * Sign out, and release the session, clear all the session data, including crypto data.
      * @param signOutFromHomeserver true if the sign out request has to be done
+     * @param ignoreServerRequestError true to ignore server error if any
      */
-    suspend fun signOut(signOutFromHomeserver: Boolean)
+    suspend fun signOut(signOutFromHomeserver: Boolean, ignoreServerRequestError: Boolean = false)
 }
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/signout/DefaultSignOutService.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/signout/DefaultSignOutService.kt
index 1bb86ecb4b..2c34f1e2d9 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/signout/DefaultSignOutService.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/signout/DefaultSignOutService.kt
@@ -35,7 +35,12 @@ internal class DefaultSignOutService @Inject constructor(
         sessionParamsStore.updateCredentials(credentials)
     }
 
-    override suspend fun signOut(signOutFromHomeserver: Boolean) {
-        return signOutTask.execute(SignOutTask.Params(signOutFromHomeserver))
+    override suspend fun signOut(signOutFromHomeserver: Boolean, ignoreServerRequestError: Boolean) {
+        return signOutTask.execute(
+                SignOutTask.Params(
+                        signOutFromHomeserver = signOutFromHomeserver,
+                        ignoreServerRequestError = ignoreServerRequestError
+                )
+        )
     }
 }
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/signout/SignOutTask.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/signout/SignOutTask.kt
index e5213c4696..f8ec23b24d 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/signout/SignOutTask.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/signout/SignOutTask.kt
@@ -30,7 +30,8 @@ import javax.inject.Inject
 
 internal interface SignOutTask : Task<SignOutTask.Params, Unit> {
     data class Params(
-            val signOutFromHomeserver: Boolean
+            val signOutFromHomeserver: Boolean,
+            val ignoreServerRequestError: Boolean,
     )
 }
 
@@ -59,7 +60,9 @@ internal class DefaultSignOutTask @Inject constructor(
                     // Ignore
                     Timber.w("Ignore error due to https://github.com/matrix-org/synapse/issues/5755")
                 } else {
-                    throw throwable
+                    if (!params.ignoreServerRequestError) {
+                        throw throwable
+                    }
                 }
             }
         }
diff --git a/vector/src/main/java/im/vector/app/features/MainActivity.kt b/vector/src/main/java/im/vector/app/features/MainActivity.kt
index ff0e9721e4..48fe092524 100644
--- a/vector/src/main/java/im/vector/app/features/MainActivity.kt
+++ b/vector/src/main/java/im/vector/app/features/MainActivity.kt
@@ -60,6 +60,7 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import kotlinx.parcelize.Parcelize
 import org.matrix.android.sdk.api.failure.GlobalError
+import org.matrix.android.sdk.api.session.Session
 import timber.log.Timber
 import javax.inject.Inject
 
@@ -262,18 +263,7 @@ class MainActivity : VectorBaseActivity<ActivityMainBinding>(), UnlockedActivity
                 }
             }
             args.clearCredentials -> {
-                lifecycleScope.launch {
-                    try {
-                        session.signOutService().signOut(!args.isUserLoggedOut)
-                    } catch (failure: Throwable) {
-                        displayError(failure)
-                        return@launch
-                    }
-                    Timber.w("SIGN_OUT: success, start app")
-                    activeSessionHolder.clearActiveSession()
-                    doLocalCleanup(clearPreferences = true, onboardingStore)
-                    startNextActivityAndFinish()
-                }
+                signout(session, onboardingStore, ignoreServerError = false)
             }
             args.clearCache -> {
                 lifecycleScope.launch {
@@ -286,6 +276,26 @@ class MainActivity : VectorBaseActivity<ActivityMainBinding>(), UnlockedActivity
         }
     }
 
+    private fun signout(
+            session: Session,
+            onboardingStore: VectorSessionStore,
+            ignoreServerError: Boolean,
+    ) {
+        lifecycleScope.launch {
+            try {
+                session.signOutService().signOut(!args.isUserLoggedOut, ignoreServerError)
+            } catch (failure: Throwable) {
+                Timber.e(failure, "SIGN_OUT: error, propose to sign out anyway")
+                displaySignOutFailedDialog(session, onboardingStore)
+                return@launch
+            }
+            Timber.w("SIGN_OUT: success, start app")
+            activeSessionHolder.clearActiveSession()
+            doLocalCleanup(clearPreferences = true, onboardingStore)
+            startNextActivityAndFinish()
+        }
+    }
+
     override fun handleInvalidToken(globalError: GlobalError.InvalidToken) {
         // No op here
         Timber.w("Ignoring invalid token global error")
@@ -313,12 +323,20 @@ class MainActivity : VectorBaseActivity<ActivityMainBinding>(), UnlockedActivity
         }
     }
 
-    private fun displayError(failure: Throwable) {
+    private fun displaySignOutFailedDialog(
+            session: Session,
+            onboardingStore: VectorSessionStore,
+    ) {
         if (lifecycle.currentState.isAtLeast(Lifecycle.State.RESUMED)) {
             MaterialAlertDialogBuilder(this)
                     .setTitle(R.string.dialog_title_error)
-                    .setMessage(errorFormatter.toHumanReadable(failure))
-                    .setPositiveButton(R.string.global_retry) { _, _ -> doCleanUp() }
+                    .setMessage(R.string.sign_out_failed_dialog_message)
+                    .setPositiveButton(R.string.sign_out_anyway) { _, _ ->
+                        signout(session, onboardingStore, ignoreServerError = true)
+                    }
+                    .setNeutralButton(R.string.global_retry) { _, _ ->
+                        signout(session, onboardingStore, ignoreServerError = false)
+                    }
                     .setNegativeButton(R.string.action_cancel) { _, _ -> startNextActivityAndFinish(ignoreClearCredentials = true) }
                     .setCancelable(false)
                     .show()