Updated November 21, 2023: We have updated this message to reflect that the change impacts administrators only and not end users. Thank you for your feedback.
In 2020, we added a PIN-based verification step to our existing phone-based verification process, to better protect your organization. If you call support, the Microsoft support representative will send a verification code to your registered email or phone in your Admin Center profile. Provide this code to the support representative to grant them access to your organization’s account.