I followed the instructions on https://en.opensuse.org/SDB:How_to_migrate_to_SLE, starting from a Leap 15.3 installation. However, the result of yast2 registration is:
Connection to registration server failed.
Details: HTTP error code: 422
The subscription with the provided Registration Code does not include the requested product ‘openSUSE Leap 15.3 x86_64’
Is assisted migration from Leap possible at all? If yes, how?