Planner ios sign in problem

Just started seeing this issue with iOS version of Planner.  We are running O365 federated via AD FS.

1) Launch Planner on iOS device.
2) Tap the "sign in" button.

3) Microsoft Authenticator app launches and prompts for federated authentication via AD FS.

4) After successful authentication, the phone switches back toPlanner, but there is a message at the bottom of the screen, "your session has expired. Sign in again."

If you tap the "sign in" button again, Authenticator will launch and re-authenticate you without prompting (because you have an active session with AD FS) and then switch you back to Planner...where you will see the same screen stating, "your session has expired. Sign in again."