FoxIDs support OAuth 2.0 as a down-party. OAuth 2.0 is not supported as an up-party.
FoxIDs support down-party OAuth 2.0 Client Credentials Authorization Grant and not the remaining Authorization Grants. Instead, OpenID Connect is used because it is more secure.
FoxIDs support OAuth 2.0 resource (API) as a down-party.
Configure your application as a down-party OAuth 2.0.