Issue with Re-enabling OAuth2 Security on APIs Configured with Mutual SSL

[Nishan-SE]

Description

Error occurs when attempting to re-enable OAuth2 application security for an API where OAuth2 had previously been disabled and only Mutual SSL was enabled.

Steps to Reproduce

1. Deploy a PizzaShark API
2. Remove the OAuth2 application security, enable Mutual SSL at the transport level, and mark it as mandatory.
3. Then attempt to re-enable OAuth2 as the security option and save the API. You will encounter this exception.

Version

APIM-4.0.0

Environment Details (with versions)

No response