Comment 2 for bug 1750415

Based upon research and discussions in IRC, turns out we do not store the application_credential_id in the token payload. This means that if the token is not pre-populated in the cache, the test will fail.

This also means that if the token cache expires, subsequent uses of the token with the application cred will also fail / have inconsistent or inappropriate behavior.

This requires a fix to add a formatter that includes application_credentials (likely more than one). The issue is identified by looking at https://github.com/openstack/keystone/blob/c80df22669ae457f8a64ddef7d31f685f9ad1e01/keystone/token/token_formatters.py and seeing that application credential is not stored anywhere but the auth methods are properly populated.