remote management invalid profile company no longer exists

Hello I have 4 ipads from my old company after we closed up the business. After updating them to iOS 15 they are getting stuck at a remote management screen saying "invalid profile" and gives the information to the MSP that we used to manage everything. Well with the company closed we no longer have support so most of the logins no longer work that they have...how can we use these ipads that we paid for at this point? We are able to log into the Apple Business Manager but there are no ipads listed there.