I am not sure if this is a rules issue or not. Anyone of you use pages manager by Facebook? It manages your business pages on Facebook.
So the issue is I have not been receiving messages via the app reliably. Then I noticed all the messages come in at once when my phone changes connection...
I use Lazada to do online shopping - it blocks the whole app where I can't load any products. The app kept asking me to "tap to retry".
I think Adguard is possibly blocking the whole domain but I'm not sure.
When I disable Adguard, the app works.