help in trust app issues

basically i have 6 apps from the same enterprise. i verified them when i downloaded them but now that i’m using them for 2-3 days. today when i opened the app it said

“Unable to Verify App

An Internet connection is required to verify trust of the developer "iPhone Distribution". This app will not be available until verified.

although i verified it and i untrusted and trusted again and still didn't work. i deleted all the apps and downloaded them again. trusted and still the same issue comes. is there anyway that knows how to deal with these? i even tried logging out of my apple account and logging back in and it still didn't work