Problem
When the admin is trying to remove SSO authentication they receive an error of Uh Oh! Cannot remove SAML config - authentication strategy in use
This is because there is at least one user on the account that has an authentication method configured using the account's existing SAML configuration (right now a SAML configuration can only be removed from an account through the UI if it is not in use at all).
Solution
The user on the account that has the SSO authentication method, would need to remove it from their Strategic Roadmaps before the existing metadata file can be removed through the UI.