"No Backups" message keeps popping up

Open Time machine preferences to check detailed status.

you might have more than one backup drive assigned. That is perfectly OK, but if one is not backing up, you need to either:

• correct the situation so that both can continue to be used -OR-

• delete the one no longer in active use.

No way to delete a backup warning from MacBook pro after migration assistant. New computer also adopted old machine password.....weird