The reason for this is that the bundle ID is already occupied, this is to reset the test certificate, then you need to modify the bundle identifier, because the test certificate is based on bundle identifier, modified to run, reset the certificate, Finally, you are prompted to enter a different string. If the previous bundle identifier is XXXXX, then no matter how the change will prompt xxxxx is invalid, an App ID with identifier "xxxxx" is not avaliable. Please enter a different string. This happens because the real bundle identifier is not changed.
To do this, search for bundle identifier in the build settings below targets. Modifies the value of the product Bundle identifier.
After modification, rerun the project, an App ID with identifier "* * * *" is not avaliable. Please enter a different string error resolution.
True machine test-please Enter a different string error resolution