Solution
The following methods have been tried one by one with success
- The operating device should be a device that has not participated in the registration
- Check the version on iPhone or iPad, and try to ensure that the device is the latest system. The minimum supported system can be found on this error page. There are official instructions in the help. Generally, the version of iPadOS will require a higher version.
- Check the settings of the device-->Is the iCloud account logged in is a developer account? Here, it is recommended to check that all related accounts of this device are changed to developer accounts.
- The most critical step is to reset the network environment, Settings --> General --> Restore --> Restore Network Settings , and then restart
tips: Remember to save all kinds of WiFi passwords first , -_-||Otherwise they will all be deleted, It is embarrassing not to be able to connect automatically, and to forget the WiFi password - Then use the 4G network , reopen the developer App, and log in again, there is a high probability that it will be fine
In the actual test, the above method may not be successful once. Once I changed the device, reset the network three times, and restarted twice before it succeeded. Anyway, the developer app experience is very bad, and patience is very important.