Hi Marc Brouwers,
Thank you for reaching out to Microsoft Q&A Forum and sharing the error message you’re encountering when trying to access Microsoft Office. I understand how confusing it can be to see this tenant-related issue.
Based on the error, it seems like the tenant does not have your account registered, and you cannot access applications under that tenant until you are added as an external user.
Here are a few steps you can try:
- Sign out and sign in again: Use a different Azure Active Directory (AAD) account that belongs to the tenant you've mentioned.
- Request tenant admin assistance: If you need access to this tenant, the administrator of tenant must add your live.com account as a guest/external user. Without this step, the tenant cannot validate your identity.
- Verify your account ownership: If you are the tenant owner or administrator, you can log into the Azure Portal with the admin account and add your live.com account as an external user.
- Check your subscription: If your Office subscription is tied to your personal live.com account, you may need to sign in directly with that account rather than attempting to access the tenant.
If you are unsure who the administrator is or if the tenant is orphaned (no active admin), you may need to initiate a Tenant Ownership/Orphaned Tenant Recovery request with Microsoft Support so they can verify ownership and help restore access.
I hope these steps clarify the situation and help you move forward.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.