Thank you for posting this in Microsoft Q&A.
To fix this problem, follow these steps:
- If you have set up other options for security verification, select Other verification options, and then try again by selecting a different option. Also, make sure that your phone numbers are correct in your user account settings.
- Ask another global admin to confirm whether your phone numbers are set correctly in your user settings.
If steps 1 and 2 don't resolve the problem, your user account may be blocked from using Microsoft Entra multifactor authentication. To check whether your user account is blocked, ask a global admin for your Microsoft cloud service to perform the following steps:
If you have a Microsoft Entra multifactor authentication or Microsoft Entra ID P1 or P2 subscription
- Go to the Azure portal, and then open Microsoft Entra ID.
- If you want to change the default active directory, click Manage tenants, choose the active directory, and then click Switch.
- Choose Users, open the profile of the user that has the problem.
- Check whether the Block sign in is enabled. If yes, disable the option.
If you have Office 365 and don't have a Microsoft Entra multifactor authentication or Microsoft Entra ID P1 or P2 subscription, contact Office 365 Support.
You can look into below article to get support numbers depending on your country.
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