Disable MFA from Read Only Service Accounts

• Login to the Office 365 admin center; 
• Go to Users > Active Users;
• Choose More > Setup Azure multi-factor auth. If you don't see this option, then you are not a global admin and you cannot perform the action.

• Find the accounts for which you want to disable MFA 

• Select the check box next to the people for whom you want to disable MFA. 
• On the right, under quick steps, you'll see Enable and Manage user settings. Choose Disable                             

 Please note that new policy recenlty introduced by Microsoft that requires MFA for all the Global Admin and privileged accounts, including the CoreView Admin Read only could cause issue to the import. 

 To resolve this problem, you need to disable the policy or, alternatively, you can exclude the admin read only accounts from this policy. 

Please refer to this article for additional details: https://techcommunity.microsoft.com/t5/Azure-Active-Directory-Identity/Baseline-security-policy-for-Azure-AD-admin-accounts-in-public/ba-p/245426

Note: In case the policy is enabled, you won't see that the MFA is enabled for the users from the Azure Active Directory Admin center.