You can't invite your Utopia team in a PL you created.
I was following the creation of a PL I was part of before and the owner couldn't invite his two teams. They contemplate the idea to invite two teams of one user to reach the count of 16 teams, but from I can reread they did not need to try, so I don't know if it is possible or not.
It's possible.
(85028517)(Yes, those are different teams, same user. Leave it to shikago to find the 'ł' character.)