Domain registration problem

Question

Domain registration problem

Bauzone, Jonathan 21

Hello,

I'm trying to register my domain on new tenant but i received this message : We've confirmed that you own itnetxxxxx.eu, but we can't add it to your account because the domain is already added to another Microsoft 365 organisation: xxxxxxxxxxxx.onmicrosoft.com.

Log in to the administration centre as administrator for this organisation and delete the itnetxxxxx.eu domain. Try resetting the administrator password if you can't log in. You should be able to add the itnetxxxx.eu domain here after completing this step.

If you are unable to access xxxxxxxxxxxxxx.onmicrosoft.com, please contact our support team for assistance.

I'm trying to delete the domain on old tenant but it seems to be desactivated : Sign-in failed

Error code: AADSTS5000224

Error message: AADSTS5000224: We are sorry, this resource is not available. If you are seeing this message by mistake, please contact Microsoft support. Trace ID: 2fc90575-f883-4fed-872f-16333b084500 Correlation ID: ca2984a9-6ee0-42e4-8e58-bdb95af39b66 Timestamp: 2025-03-12 13:28:42Z

Can you help me ?

Raja Pothuraju 47,825 Reputation points Microsoft Employee Moderator

2025-03-14T11:40:00.7566667+00:00

Hello @Bauzone, Jonathan,

Based on your description, it looks like you're encountering error code AADSTS5000224 while accessing the Azure Portal. This error typically occurs when authentication for your Azure tenant has been temporarily disabled due to a recent security incident. To resolve this, we need to re-enable authentication for your tenant.

As you shared the tenant details via email, I have involved the Product Group team to remove the authentication block.

Once the block is removed, I'll provide you with an update here.
Raja Pothuraju 47,825 Reputation points Microsoft Employee Moderator

2025-03-18T21:45:58.8066667+00:00

Hello @Bauzone, Jonathan,

I just wanted to check if you'd be interested in taking this offline to get this resolved. Please feel free share the necessary details over private message.

Answer accepted by question author

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Your answer

Raja Pothuraju 47,825 Reputation points Microsoft Employee Moderator

2025-03-14T11:40:00.7566667+00:00

Hello @Bauzone, Jonathan,

Based on your description, it looks like you're encountering error code AADSTS5000224 while accessing the Azure Portal. This error typically occurs when authentication for your Azure tenant has been temporarily disabled due to a recent security incident. To resolve this, we need to re-enable authentication for your tenant.

As you shared the tenant details via email, I have involved the Product Group team to remove the authentication block.

Once the block is removed, I'll provide you with an update here.
Raja Pothuraju 47,825 Reputation points Microsoft Employee Moderator

2025-03-18T21:45:58.8066667+00:00

Hello @Bauzone, Jonathan,

I just wanted to check if you'd be interested in taking this offline to get this resolved. Please feel free share the necessary details over private message.

Answer 1

Raja Pothuraju 47,825 Microsoft Employee Moderator

Hello @Bauzone, Jonathan,

Thank you for sharing required details over email.

The issue you were facing occurred because your tenant was identified as one of the CDX tenant which caused it to be blocked. To resolve this, we reached out to the Product Group team internally. They have since unblocked/re-authenticated your tenant, and please check and confirm, if you are able to access it successfully or not.

Microsoft uses a combination of insights based on the properties of a tenant to determine if the tenant belongs to Microsoft or not. As part of our security hardening practices, we routinely disable tenants to comply with internal lifecycle policy. Since this tenant was incorrectly identified as belonging to Microsoft, it was disabled as part of Microsoft's internal lifecycle policy. Since this issue was identified, we have improved our tenant identification checks and have added new verification to our logic. We apologize for any inconvenience caused.

You can now log back into your old tenant, remove the custom domain from it, and then verify the domain in your new directory. Let me know if you need any assistance!

I hope this information is helpful. Please feel free to reach out if you have any further questions.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Raja Pothuraju 47,825 Reputation points Microsoft Employee Moderator

2025-03-19T23:15:06.96+00:00

Hello @Bauzone, Jonathan,

The PG team has re-authenticated your tenant. You can now log back into your M365 tenant, remove the custom domain, and then verify it in your new directory.
Raja Pothuraju 47,825 Reputation points Microsoft Employee Moderator

2025-03-24T20:16:49.6033333+00:00

Hello @Bauzone, Jonathan,

The PG team has re-authenticated your tenant. You can now log back into your M365 tenant, remove the custom domain, and then verify it in your new directory.