Acrobat Pro DC shared review cannot resolve email addresses through Outlook

I’ve run into a persistent issue since I switched to a Windows 10 computer, one I did not have before with Windows 7 and the same version of Adobe Acrobat Pro DC.

When I use Send for Review for shared commenting and try to add email addresses that are in my company’s Outlook 2016 network, I get this message about the ExchangeLabs and Exchange Administrative Group:

And this follow-up one as I try to resolve it:

I try to replace that text with their exact email addresses, both by using the “Show More Names” browsing window and by pasting their full email addresses, but nothing works. Any help would be appreciated.

Thank you!