Symptoms

The user received the following email after the expiration of an oAuth token:

The admin refresh token is expired.
See the details below for the site and refresh token URL.

K2 integration for the below resource has stopped working. Regenerate the token now. Changing the password of the user associated with the token below will result in an invalid refresh token until the resource is trusted again.
 

Diagnoses

This was the result of an expiration of an oAuth token.

 

Resolution

Since the user had no development on the site in which the token had expired we just reran the registration wizard to refresh said token.