In the TestFlight app, if you saw a message says ”the developer removed you from the test program.” that’s a bug of TestFlight. I did not remove anyone from the test program of Mona Beta.
To continue using Mona Beta, please tap “Stop Testing” on TestFlight’s Mona Beta page, then use this invitation link to re-enter our test group: https://testflight.apple.com/join/xNdgUbh6