unsupported_grant_type

OAuth (Sign in with Tickwire): the token endpoint only supports authorization_code and refresh_token.

HTTP 400.

Likely cause: grant_type is password, client_credentials, implicit or another type.

What to do: Use the authorization code flow with PKCE.

Retry: No. The same request gets the same answer; change something first.

Listed under Sign in with Tickwire (OAuth) in Errors. Send the error’s requestId to support and we can find the request.