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Shared Mailbox suddenly locked
I have a shared mailbox that was working fine and now suddenly it is locked based on failures and it states in the log that conditional access policy Security Defaults is showing Grant Controls Block...
- What we found was that the account was both licensed and a shared folder and we decided to unlicense the account and the user was able to access the mailbox through the delegation.
Hi Brandon,
I suppose you have a shared mailbox with a Microsoft 365 license so you can access it without delegation?
Navigate to portal.azure.com > User > select the user > Authentication methodes > Require re-register multifactor authentication. The next time you log on to the mailbox, you can register MFA.
Please check my post regading security defaults enforcement:
https://techcommunity.microsoft.com/t5/identity-authentication/multi-factor-authentication-mfa-via-security-defaults-enforced/m-p/3819792
This doesn’t seem to be what is wrong for us. I have set the reregister MFA policy and set an address for the code in the admin portal. But when I try to login I don’t even get to the MFA screen, I get this now directly after username and password screen.