Unable to signup for developer M365 sandbox - phone number did not pass security checks

Question

Hi

I have not been able to finish sign-up process for a new M365 developer sandbox subscription. When I reach the "add phone number for security" part, regardless of which phone number I have entered ( have tried with my work / personal / brand new pre-paid mobile number, all Finnish numbers with a +358 country code) , I always end up with the following error message:

"We can't continue with the signup process for the following reason:

Your phone number did not pass security checks. MS-CorrelationId: 00000000-095e-4319-8092-404f24faea94 Code: 40351"

I have been receiving the same response for some time now (over a period of two months) without any change in the behavior of the sign-up process. Could someone provide assistance with this?

Please do not forward me to M365 community support as they have already replied to me "...it's beyond the scope of this community support as it's more suitable to be addressed on Microsoft Learn...."

BR, Jippe

Answer 1

Hi Jippe ZZZ,

Thank you for reaching out to us on the Microsoft Q&A forum.

From your description, it seems your issue is with Microsoft 365 Developer Program sandbox subscription.

We regret to learn that you're encountering difficulties while attempting to join the developer program. The issue may stem from one of two reasons:

1. Country-specific outages: Recently, we experienced service disruptions, leading to temporary blocks on registrations from various countries. Although this problem has been resolved, please be aware of the following geographic limitations. Due to technical and security considerations, the Microsoft 365 Developer Program only extends support to select countries/regions as outlined in the Microsoft 365 International Availability list. We periodically review and update the list of supported countries. If your country or region is not currently supported, it means we are unable to accommodate registrations from there at this time.
2. Membership benefits: While you can still enroll in the developer program, access to the free Microsoft 365 E5 subscription is currently paused for the short-term while we adjust the qualifications for that benefit.

Microsoft consistently monitor and take action against any suspicious activities to safeguard both our customers and Microsoft platforms from fraudulent behavior, compromised accounts, and other malicious actions. Our measures range from preventing unauthorized users from joining our program to disabling subscriptions.

For more updates follow our blog: Microsoft 365 Developer Program.

Note: Microsoft 365 Business Basic Trial offers a complimentary one-month trial period when you provide your credit card details.

Business Support: Microsoft 365 for business support phone numbers by country or region.

Hope the above information can help.

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