Microsoft Entra ID still shows old tenant information after Microsoft-performed Microsoft 365 tenant migration

Question

Microsoft Entra ID tenant still displays old company information after Microsoft 365 tenant migration

Environment

Microsoft 365 Business

Microsoft Entra ID

Microsoft 365 Admin Center

Microsoft Authenticator

Windows 11

Tenant migration performed by Microsoft Support

Problem

Microsoft Support migrated my Microsoft 365 environment from my previous company to a newly established company.

Unfortunately, the migration appears to be incomplete.

Although my domain, users, mailboxes and Microsoft 365 services are working correctly, my Microsoft Entra ID environment still references information from the previous company in several places.

This causes several issues:

The Entra environment still appears to belong to the previous company.

I continue to receive security and authentication prompts that seem to reference the old configuration.

Some Microsoft services still appear to use information from the previous tenant.

I would like to completely remove every reference to the previous company because it no longer exists.

What I have already checked

The domain migration has been completed.

Microsoft 365 services are working correctly.

User accounts are working correctly.

Authentication methods have been reviewed.

The previous company is no longer in use.

The migration itself was performed by Microsoft Support.

Additional question regarding the migration

One additional question concerns responsibility for the migration itself.

Since the migration was planned and performed by Microsoft Support, I would assume that Microsoft Support is responsible for ensuring that the migration is completed successfully and that all tenant configuration is transferred correctly.

If the migration is indeed incomplete, is there anything the customer is expected to do after Microsoft has completed the migration, or should Microsoft Support complete the remaining migration tasks?

At the moment, it is difficult for me to determine whether this is a configuration issue on my side or whether the migration itself was not fully completed.

Questions

Is there a supported way to completely update or clean up a Microsoft Entra ID tenant after a Microsoft-performed migration?

Could this behavior indicate that the migration was not completed successfully?

Which tenant settings or objects should I verify?

Tenant display name

Organization profile

Initial *.onmicrosoft.com domain

Company information

Microsoft Entra configuration

Any other tenant-related objects

Has anyone experienced a similar issue after a Microsoft-performed tenant migration?

Any guidance would be greatly appreciated.

Thank you.

Answer 1

Hallo Jens,

vielen Dank für deine Anfrage.

Anfrage im deutschsprachigen Forum sollten in deutscher Sprache eingestellt werden.

Eröffne eine Anfrage im AdminCenter.

Ich freue mich auf deine Rückfrage.

Answer 2

Since you posted your question in English, I’ll reply in this language as well. If you’re more comfortable using another language, please let me know, I’ll be happy to tailor my response to your preferred language. 

Hello @Jens Mai | Nyrons,

Based on my understanding, the responsibility of this migration is shared between Microsoft Support and the tenant admin, and it depends on what was included in the original migration scope. Since your core services (users, mailboxes, domain) are working correctly, this generally indicates that the migration itself was completed successfully at the workload level.

The remaining issue (old company information appearing in Entra ID or authentication prompts) is more likely related to:

• Tenant metadata that was not updated
• Cached or identity-related settings

This does not necessarily indicate a failed migration, but rather incomplete post‑migration cleanup or configuration.

Since your scenario already involves a migration performed by Microsoft Support, I would recommend continuing to work directly with the same support agent or team handling your case. They have access to internal tools and backend information that are not available through the common channels, which allows them to properly verify tenant-level configuration and identify any remaining migration-related inconsistencies.

If your previous support case has already been closed, you can reopen it within 7 days from the Microsoft 365 admin center by going to Help & Support > History / Support History, and selecting the relevant case.

If more than 7 days have passed, you can create a new support request instead.

The support agent will be able to confirm whether the behavior you are seeing is expected after the migration or if any additional actions are required, and advise you on the appropriate next steps.

If you need anything else please don't hesitate to reply. Thank you for your time and for providing detailed information about your case.

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