Facebook has no connectivity over WiFi, everything else works.

I have an Iphone 11 Pro Max, which while on cellular with AT&T everything works fine. However, when WiFi is turned on, Facebook app and Email (only the apps) stops loading content.

What I have tried:

• restarting the phone
• reinstalling the app
• forgetting the network
• trying a different WiFi
• resetting the phone to an earlier image
• using DFU mode to factory reset the phone.
• the phone is not blocked in my WiFi router.
• Internet Pages work fine and so does other apps like tiktok. Only email and facebook do not have connectivity. The apps open, but nothing is loading.