I believe the above domain belongs to Signal messaging.
Is there any reason why it is blocked? https://i.postimg.cc/8PShfhcN/Screenshot-20260803-163010-iode-2.jpg
Onesignal.com offers a commercial notification service, look at their website and reviews. Total different to the Signal messenger.
Thanks @laneb
Your support is very much appreciated. I did ask because I had a bit of trouble to receive messages.
My request is solved