We are experiencing the same issue with our MDM. Our older IOS versions were kept on the old IOS and thankfully still work. Hoping IOS 14.4 will fix this. UPDATE: IOS 14.4 did work with our one device so far. We erased the device first with the MDM, after updating to IOS 14.4 and when the apps pushed back on, it opens and runs. _Testing it out for a week before updating the rest of our devices. Thank you