Similar situation for me. I handle all vendor billing and account administration, but since I do not use this platform, I do not want to pay for a Team license for myself just to manage annual billing. I need to delegate our dev team's manager deal with it.
Cannot figure out how to set someone else as an admin. If I try to leave the account, it says I need to assign someone else as an admin. If I click the "Assign an Admin" button, it pops up the member list. There is no option to select another member and no instructions on how to do so. There is also no way to see who is or is not an Admin currently.