The endpoint(s) supporting lists of teams by coachID can provide a list of teams by Team:Account:Region for the App to display to an active coach, limiting their visibility to only regions they are already assigned to

Refer to the app ticket for more detail:
https://github.com/AmericaSCORESBayArea/AmericaScores-attendanceApp/issues/23

This is particularly important to supporting different contract organizations, such as school districts .

A coach may be contracted to only one school district, or several, but in either case, they should see only teams in regions they are already active.