Due to an unknown change in Googles services any user who needed to grant scope consent was instead given an unknown error. This prevented login for all new users, as well as other users that needed to grant scope consent.
June 27th: First support ticket detailing the issue was received.
June 29th: Due to further tickets being received and investigation the development team realizes all customers and services are affected.
July 13th: Google fixed the issue and the incident was resolved.