Some apps say I’m offline…

…when I’m actually online and connected to a WiFi signal. For example, on Discord, a message says “network connectivity limited or unavailable.” It has nothing to do with WiFi as all other devices around me (regardless of WiFi network) work perfectly. In the past, when I had no connectivity, cellular data kicked in…but not now.

Strangely, I can surf freely on Safari, use my Waze and map apps, so the problem doesn’t affect all apps.

I’ve tried:

Deleting & reloading the affected app

Turning my phone off/on

Resetting network settings

Going to my ISP and verifying that I can access a network and make/receive calls

Nothing works!

Any suggestions? I’ve even just recently updated to iOS 15.