Benoit,
It seems you're experiencing issues with federation when trying to share information with an external Microsoft tenant. The error message you're encountering typically indicates a problem with the federation configuration or a potential issue with the external organization's federation services.
Here are some steps you can take to troubleshoot the issue:
Verify Federation Trust: Ensure that the federation trust is correctly set up between your organization and the external tenant. This includes checking the federation settings in the Office 365 admin center.
- Check DNS Configuration: Make sure that the DNS records for Autodiscover and other federation-related services are correctly configured and propagated.
- PowerShell Cmdlets: The
Get-FederationInformation
cmdlet should provide information about the external organization's federation configuration. If this is failing, it could indicate an issue with their configuration. - Test with Other Domains: Since you mentioned it works with two other domains, compare the federation configuration of those domains with the one that's failing to identify any discrepancies.
- Check Service Health: Look at the Office 365 Service Health Dashboard to see if there are any known issues with federation services that could be affecting your ability to establish an organization relationship.
- Contact Microsoft Support: If the issue persists, reaching out to Microsoft Support may be necessary. They can provide more detailed troubleshooting steps and assistance.
Remember, federation issues can be complex and may require detailed investigation. If you have access to the external tenant's IT administrators, collaborating with them could help resolve the issue more efficiently.
If you need further assistance or have additional information, please let me know.