You have a Microsoft 365 subscription and a hybrid deployment of Azure Active Directory (Azure AD). User identities and password hashes are synced.
You have a user account named User1.
From Active Directory, you select the User must change password at next logon account option for User1.
What will occur if User1 attempts to sign m to myapps.microsoft.com?
A . User1 will sign in by using the old password.
B . User1 will be prompted for a password change.
C . User1 will be prevented from signing in.
Answer: C
Explanation:
Troubleshoot password synchronization Some users can’t sign in to Office 365, Azure, or Microsoft Intune In this scenario, passwords of most users appear to be syncing.
However, there are some users whose passwords appear not to sync. The following are scenarios in which a user cannot sign in to a Microsoft cloud service such as Office 365, Azure, or Intune. They include information about how to troubleshoot each scenario.
Scenario 1: The "User must change password at next logon" check box is selected for the user’s account To resolve this issue, follow these steps:
Do one of the following: In the user account properties in Active Directory Users and Computers, clear the User must change password at next logon check box. Have the user change their on-premises user account password.
Wait a few minutes for the change to sync between the on-premises Active Directory Domain Services (AD DS) and Azure AD.
References: https://support.microsoft.com/en-us/help/2855271/how-to-troubleshoot-password-synchronizationwhen-using-an-azure-ad-sy