Getting Error "The phone number you provided is unreachable." in Azure AD B2C custom policy.

Ankit Neema 0

I am getting error during the phone number verification process, after clicking "Send Code" I received the error message "The phone number you provided is unreachable".

Thanks,

Janaki Kota 465 Reputation points Microsoft Vendor

2025-01-28T17:31:44.7766667+00:00

Hello @Ankit Neema,

Thank you for reaching out to Microsoft Q&A.

We understand that you are getting an error during the phone number verification process, after clicking "Send Code".

Typically, sometimes, if you click "Send Code" multiple times it may also lead to this error. Try to wait for a few minutes before trying again. In this scenario, generally it is a safeguard to prevent abuse or excessive requests, which can be seen as a form of rate limiting. In Azure AD B2C, there are built-in mechanisms to prevent abuse of the phone verification process, such as limiting the number of verification codes that can be sent in a short period. This helps to prevent potential denial-of-service attacks or abuse of the phone verification service. Also, ensure that you are entering the phone number in the correct format, including the country code. Further try adding any other phone number and confirm if you are facing the similar issue with that aswell.

Hope this helps. Do let us know if you any further queries.

Thanks & Best Regards

Janaki Kota
Janaki Kota 465 Reputation points Microsoft Vendor

2025-01-29T12:40:18.85+00:00

Hello @Ankit Neema,

Following up to see if the above suggestion was helpful. And, if you have any further query do let us know.
Ankit Neema 0 Reputation points

2025-01-29T12:46:50.7+00:00

The issue is still persisting, and it is affecting only one user. same user was able to login few days back without any issue.
Janaki Kota 465 Reputation points Microsoft Vendor

2025-01-29T13:05:35.2266667+00:00

Hello @Ankit Neema,

Thanks for the prompt response.

Could you please confirm if any particular browser user agent is noticed from the sign-in logs. Also, from which region user belong to any specific country users experiencing this issue?
Ankit Neema 0 Reputation points

2025-01-29T13:17:24.4533333+00:00

Chrome browser and facing issue with US number.
Janaki Kota 465 Reputation points Microsoft Vendor

2025-01-31T10:30:25.6666667+00:00

Hello @Ankit Neema,

Thanks for the response.

We are checking this internally. We will provide an update at the earliest.

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Getting Error "The phone number you provided is unreachable." in Azure AD B2C custom policy.

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