Here's the error that's popping up whenever I'm trying to open the app:
I do have Internet connections. I restarted the iPad multiple times and reconnected to the Internet multiple times too. If it helps, one of provisioning profiles was invalid earlier:
So I enabled it, which generated a <something>.mobileprovision
file, what should I do with it?
-------------------------UPDATE 1-------------------------
I opened "Device Management" in Settings > General, here's what's inside:
Finally, when I go to "More Details" of this profile, I see:
You should go to your iPhone Settings > General > Device Management and then trust your associated certificate. Hope this helps .