Hope this may be a partial answer for some. I was having this issue big time with two of my iPad's. I was using Xcode 13.1 for one project because it uses SwiftRealm, which is not compatible with 13.2.1 (due to a compiler version issue). But having read some of the responses here, I decided to try to see if these iPads would be able to get updated for developer use if I used the Devices window on Xcode 13.2. Indeed that worked for both of them! (I also have some kind of issue where Xcode asks me over and over for access to my Downloads folder. I always agree, but it doesn't seem to matter much.) So then I went back to 13.1 to see if I could now download the app that uses RealmSwift onto the iPads. Though they are both iPad Air 2's, it worked great with one, but the other is giving me an obscure error where it says it is unable to download it because of some version mismatch, which it wanted me to report to Apple if the message was not correct. And when I retried it, it went back to saying that iPad could not be prepared for development. Then, with this second iPad, I went back to the 13.2.1 Xcode, which was perfectly fine with downloading code to it, after I agreed that it could access the Downloads folder (again). And when I went back to 13.1, this time the second iPad worked as well. So now they are both working with my 13.1 app, at least for the moment. Surely something is flaky here, but I can't quite fully describe it.