Hi @Anonymous ,
Based on the needs that you mentioned, I think the MicrosoftTeams.GetAllTeams().value function could achieve your needs.
I have made a test on my side, please consider take a try with the following workaround:
Add a Dropdown control in your app, then set the Items property to following:
MicrosoftTeams.GetAllTeams().value
then set the Value property to displayName column. If you want to get the id value of the selected Team, please take a try with the following formula:
Dropdown1.Selected.id
Please consider take a try with above solution, check if the issue is solved.
Best regards,