22/03/2023 08:30:00 AM (GMT)
NHSmail Reference : INC34922293
Microsoft Reference : MO531385
Issue Status : RESOLVED
Issue Description : Some users may be unable to access multiple Microsoft 365 services using a specific Multi-Factor Authentication (MFA)
More Information : Impact is specific to users attempting to utilize the voice to office phone with extensions MFA method. As a workaround, users may be able to use alternate authentication methods to complete their sign in e.g. Authenticator application, Short Message Service (SMS) or Time-based one-time password (TOTP).
Final Update : 22/03/2023 09:29:00 AM – Microsoft have successfully reverted the offending change and confirmed that service was restored after monitoring the environment.
Scope of impact : Your organization is affected by this event, and some users attempting to access multiple Microsoft 365 services using a specific MFA method may be impacted.
Root cause : An issue has occurred when updating the time zone information for Daylight Saving for users in Mexico, causing the reported impact.
Next steps : Microsoft are reviewing their standard service update procedures to better identify similar issues during their development and testing cycles.