Invalid Input

In a ThinOS 10 policy, I'm trying to remove Imprivata as the authentication type in 3rd Party Authentication Settings.  When I Save and Publish, I get an Invalid Input error.  I can change anything else and the policy saves. I upgraded from 5.4 to 5.5 hoping that would fix the issue, but no luck.  There doesn't seem to be any logs anywhere that expand on the error to give some direction on what the problem is.