diff --git a/changelog.d/4847.bugfix b/changelog.d/4847.bugfix
new file mode 100644
index 0000000000..d311882934
--- /dev/null
+++ b/changelog.d/4847.bugfix
@@ -0,0 +1 @@
+Translate the error observed when the user is not allowed to join a room
\ No newline at end of file
diff --git a/vector/src/main/java/im/vector/app/core/error/ErrorFormatter.kt b/vector/src/main/java/im/vector/app/core/error/ErrorFormatter.kt
index 6494f31336..8640fa6f05 100644
--- a/vector/src/main/java/im/vector/app/core/error/ErrorFormatter.kt
+++ b/vector/src/main/java/im/vector/app/core/error/ErrorFormatter.kt
@@ -100,6 +100,10 @@ class DefaultErrorFormatter @Inject constructor(
                     throwable.error.code == MatrixError.M_THREEPID_AUTH_FAILED    -> {
                         stringProvider.getString(R.string.error_threepid_auth_failed)
                     }
+                    throwable.error.code == MatrixError.M_UNKNOWN &&
+                            throwable.error.message == "Not allowed to join this room" -> {
+                        stringProvider.getString(R.string.room_error_access_unauthorized)
+                    }
                     else                                                          -> {
                         throwable.error.message.takeIf { it.isNotEmpty() }
                                 ?: throwable.error.code.takeIf { it.isNotEmpty() }
diff --git a/vector/src/main/res/values/strings.xml b/vector/src/main/res/values/strings.xml
index 2bebefeef2..9886a9f009 100644
--- a/vector/src/main/res/values/strings.xml
+++ b/vector/src/main/res/values/strings.xml
@@ -169,6 +169,7 @@
 
     <!-- room error messages -->
     <string name="room_error_join_failed_empty_room">It is not currently possible to re-join an empty room.</string>
+    <string name="room_error_access_unauthorized">You are not allowed to join this room</string>
 
     <!-- medium friendly name -->
     <string name="medium_email">Email address</string>