We’ve recently been advised that Microsoft has placed restrictions on our emails due to spam-related concerns.
As a result, authentication and email delivery involving Microsoft domains such as hotmail.com, live.com, outlook.com, and variants are likely to be temporarily unreliable or blocked.
We would not recommend using Microsoft 365 SSO either right now, as it could lead to ongoing login and verification issues for our users. In the meantime, we recommend either:
Using Google authenticator, Microsoft Authenticator or Authy app for login security, or
Switching to a different email domain other than Microsoft domains for your alternative email
We understand this isn’t ideal, and we’re continuing to monitor and work on this to restore 2FA services to normal.