Issue #3466718: Subscription Controller Flag Error not returning flag name

message_subscribe_ui/src/Controller/SubscriptionController.php

@@ -206,7 +206,7 @@ final class SubscriptionController extends ControllerBase {
       // Check that the flag is valid.
       $rel_flag = $this->flagService->getFlagById($relationship['flag']);
       if (!$rel_flag || (!$rel_flag->status())) {
-        throw new MessageSubscribeException('Flag "' . $relationships['flag'] . '" is not setup correctly. It is probably disabled or have no bundles configured.');
+        throw new MessageSubscribeException('Flag "' . $relationship['flag'] . '" is not setup correctly. It is probably disabled or has no bundles configured.');
       }
     }