Apps not connecting to the internet

My iPhone 11 is able to use the internet through safari on both Wi-Fi and mobile data. Apps are unable to access the internet either on Wi-Fi or mobile data.

I have just updated to iOS15 in order to try to fix the issue. It did not work.

I have also removed internet settings and re-entered the password. I have turned my phone off and on about 20 times. I have deleted the apps that were not working, reinstalled them, and now I’m unable to log in because they still won’t connect to the internet.

What exactly should I do?