Hello abking287,
Thanks for clarifying.
Since this is inside the Apple Music app on Tesla, it's likely the fact the App does not remember the sign-in. Not sure if this is from two-factor, or the time the car was shutdown.
Check with Tesla to see if they had issues like this reported, as they may have a solution or a firmware update for the stereo to correct this. Check your user manual to check for how to update the stereo.
There have been others with this issue too, see if the options help here: Tesla Support Threads
If Tesla doesn't have anything to help, and those options above do not help, please contact Apple Support to investigate this with you further: Get Support
Thanks.