Account has been blocked error when sign in to Microsoft 365
https://learn.microsoft.com/en-us/microsoft-365/troubleshoot/access-management/account-blocked-error-when-sign-in
WebMar 16, 2023 · Sign in to the Microsoft 365 portal as an admin. Under Users, Select Active Users. Locate the user, and then click the users Display name to open the settings pane. At the top of the pane, select Unblock sign-in. In the Unblock sign-in screen, de-select Block this user from signing in and click Save changes. Method 3: Reset the user's password.
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