Managed IT school ID or business account or app developer id

My device says I am up to date but if I try to open chrome or safari it says cand open page cause it can’t find server or the page is invalid. Sometimes it tells me I need to update the Samsung android device I’m on but I’m on my iPhone 13 or my iPad . I don’t have android. It also tells me to get my apps from the App Store and that id where I downloaded them but it says they came from Microsoft and they all start with a web address of com.what the app is.net. I don’t understand what’s going on. I try factory setting all devices, switching carriers, new devices, new accounts so many times and it is always there the min I set up every new device. This is also happening to several other devices in our home and family in the area. What can we do? Thanks for any help.