8 digit phone number to verify MFA

Question

8 digit phone number to verify MFA

RaGau 145

i HAVE 8 DIGIT PHONE NUMBER FROM DENMARK AND NEED TO VERIFY FOR THE MFA, ITS GIVING ERROR HOW TO WORK THIS, MICROSOFT SHOULD EXCEPT THESE NUMBERS AS WELL.

How to register for MFA using m365

RaGau 145 Reputation points

2026-05-31T12:13:06.6633333+00:00

I tried both methods, sms and phone both gave error
Nathan Roberts (SN) 11,806 Reputation points Volunteer Moderator

2026-05-31T13:24:01.55+00:00

Hey there, RaGau

What error message does it provide when you try and add your phone number?

Thanks,
Nathan
Shubham Sharma 17,755 Reputation points Microsoft External Staff Moderator

2026-06-01T01:40:08.6533333+00:00

RaGau

Based on the details you’ve shared, this appears to be a tenant lockout scenario.

To resolve this, the recommended approach is to contact the Microsoft Data Protection team. You can reach them by calling Microsoft Customer Service using the phone numbers listed here: https://support.microsoft.com/en-us/topic/customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2

If you have access to another tenant or subscription where you still have Global Administrator privileges, you may also raise a support request from there to get assistance in restoring access to the affected tenant.

For future reference and to help prevent tenant lockouts, please check: https://learn.microsoft.com/en-us/partner-center/customers/gdap-preventing-tenant-lockouts

If neither option is possible, let us know, we are happy to assist you further!
Shubham Sharma 17,755 Reputation points Microsoft External Staff Moderator

2026-06-02T05:31:10.67+00:00

RaGau

Following up to check if the resolution provided was helpful. Let us know if you need any further assistance.

1 answer

Your answer

RaGau 145 Reputation points

2026-05-31T12:13:06.6633333+00:00

I tried both methods, sms and phone both gave error
Nathan Roberts (SN) 11,806 Reputation points Volunteer Moderator

2026-05-31T13:24:01.55+00:00

Hey there, RaGau

What error message does it provide when you try and add your phone number?

Thanks,
Nathan
Shubham Sharma 17,755 Reputation points Microsoft External Staff Moderator

2026-06-01T01:40:08.6533333+00:00

RaGau

Based on the details you’ve shared, this appears to be a tenant lockout scenario.

To resolve this, the recommended approach is to contact the Microsoft Data Protection team. You can reach them by calling Microsoft Customer Service using the phone numbers listed here: https://support.microsoft.com/en-us/topic/customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2

If you have access to another tenant or subscription where you still have Global Administrator privileges, you may also raise a support request from there to get assistance in restoring access to the affected tenant.

For future reference and to help prevent tenant lockouts, please check: https://learn.microsoft.com/en-us/partner-center/customers/gdap-preventing-tenant-lockouts

If neither option is possible, let us know, we are happy to assist you further!
Shubham Sharma 17,755 Reputation points Microsoft External Staff Moderator

2026-06-02T05:31:10.67+00:00

RaGau

Following up to check if the resolution provided was helpful. Let us know if you need any further assistance.

Answer 1

Denmark phone numbers are supported for Microsoft 365 MFA. The number must be entered in full international format with the correct country/region code and as a phone authentication method, not as an extension or office number.

To register MFA for Microsoft 365 and add the Danish phone number:

Sign in to Microsoft 365 with the work or school account and password as usual. After choosing Sign in, more information is requested.
Select Next to start MFA setup.
When asked for the authentication method, select I want to set up a different method.
Choose Phone as the method.
Select the correct country/region for Denmark and enter the 8‑digit mobile number without leading zeros or extra characters, in the phone field.
Complete the verification (Microsoft 365 sends an SMS or call with a verification code). Enter the code when prompted.
Finish the wizard. Next time signing in, the additional verification (code sent by SMS or call) is requested.

If an error still appears when using the phone method:

Confirm the country/region code and number are correct and that the number is a valid mobile or voice‑capable line.
Try an alternative MFA method such as the Microsoft Authenticator app, which is the default and recommended method.
If phone verification continues to fail, contact the Microsoft Entra administrator to review the configured authentication methods and phone number on the user object and, if needed, to reset MFA (Require re‑register MFA) so methods can be configured again.

References:

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8 digit phone number to verify MFA

1 answer

Your answer