Sometimes, a device can have an account which has been signed out (such as by revoking the device's access to an account using https://myaccount.google.com/device-activity). This leads to bad UX in the app if the user switches to such an account:

Steps:
1. Set up a signed-out or "bad" account on the device.
2. Launch the CRD app, open the Navigation drawer and switch to the "bad" account (if not already switched).

Expected:
The app should either:
1. Display an error screen immediately.
2. Decline to switch to the broken account, re-selecting the previous account instead.
3. Prompt the user to sign into the switched account. If sign-in is cancelled or failed, the app should do either 1 or 2 above.

Actual:
The app prompts the user to sign into the switched account, but does it repeatedly forever if the user tries to back out. The app doesn't allow the user to switch back to a working account. So it's completely broken and unusable until it's recovered by one of the following:
1. Signing in successfully to the bad account.
2. Deleting the bad account from the device.
3. Clearing the app's data storage or reinstalling the app (which would also delete any stored pairings).
I checked some other Google apps with the standard Google account-switcher, and they don't seem to have this bug - they follow one of the "Expected" options above.