SP-migration tries to validate the choosen channels by backtracking to their origin and checking if they are based on SUSE vendor channels.
Depending on how you cloned, this 'backlink' seems to be broken.

Please open a support request for further investigation.

SP migration is also available via the SUSE Manager API. The API does not do any checking and you can easily break your system by choosing the wrong channels. With great power comes great responsibility.