Hi,
I’m the company admin and billing owner and need to delete a few test teams that I created with my personal user which is deleted.
Ive tried to request to join but there’s no other members that could accept my request.
Welcome to the Asana Community Forum @Patrick_Pedersen 
Either set up your personal user again in order to delete them or just reach out to Asana Support and they will be able to assist in having these teams deleted for you 