remove - https://www.googleapis.com/auth/aiplatform from scopes.

You are receiving this error either because your input OAuth2 scope name is invalid or it refers to a newer scope that is outside the domain of this legacy API.
This API was built at a time when the scope name format was not yet standardized. This is no longer the case and all valid scope names (both old and new) are catalogued at https://developers.google.com/identity/protocols/oauth2/scopes. Use that webpage to lookup (manually) the scope name associated with the API you are trying to call and use it to craft your OAuth2 request.