seems fixed

Regarding conference rooms, we found a bug in MAPI that prevents them from working. They work fine in EWS as it's properly returning the info for domain conference rooms. MAPI, however, is not. We're looking into it and hoping we can get it fixed in the next BETA.

As a workaround for now -- until we can get the bugs worked out -- you can create a new user and use their calendar as the "domain resource" -- just share their primary calendar with everyone in the organization, giving control as needed to your users. Secondary calendars can be used as domain shares as well. 

@Sebastien -- I can access the GAL via my Address Book in Outlook 2019. Are you not able to? 

Hello Derek,

When I first tested it, I wasn't able to access it from either the popup you have when you select a contact or from the Adressbook. After testing it again today this seems to work.
Maybe we applied the latest update for the public beta in between.

So I think my comment is not relevant anymore.

Kind regards

Thanks for replying and letting us know, Sebastien!