Custom Domain for O365 Groups in a Federated Hybrid Environment

So, I'm trying to wrap my head around my current problem and could use a little help. What we have: Office 365 with a verified custom domain (e.g. contoso.com) Exchange 2013 onPrem also the M...

exchange

groups

Office 365 Groups

TonyRedmond

MVP

Sep 20, 2016

I would log a call with Microsoft support and get some help to work through this scenario. It is definitely supported to have Office 365 groups synchronized back to an on-premises AD using the latest version of AADconnect. The multi-domain article you reference has nothing to do with hybrid interoperability.

Ivan54

Bronze Contributor

Oct 04, 2016

Hi Tony, I've talked to our CSP and they weren't able to find any articles that confirm this functionality explicitly.

I've managed to enable the subdomain (e.g. groups.contoso.com) for our tenant have that synced back to onPrem (e.g. groupsname@groups.contoso.com). Reminder: MX records for groups.contoso.com point to O365 directly.

I've added additionaly aliases (groupsname@contoso.com) to the group, but I'm unable to get mail through to the group by using any aliases from external or internal. Reminder: MX records for contoso.com point onPrem.

Do you have any documentation that mentions functioning vanity domains for Office 365 Groups in a federated (ADFS) environment?

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Custom Domain for O365 Groups in a Federated Hybrid Environment

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