Hello @Gerald O'Hara ,
Thanks for your query.
1.Could you please download and install Microsoft Remote Desktop Beta for Mac OS Version 10.6.8 (1898) on your device and check if the same issue would happen? https://install.appcenter.ms/orgs/rdmacios-k2vy/apps/microsoft-remote-desktop-for-mac/distribution_groups/all-users-of-microsoft-remote-desktop-for-mac
2.Did you upgrade your Mac computer OS to the latest version?
3.Please open RDC on MAC, when you clicking the new “+” icon to add a new remote desktop connection, it opens the Edit Remote Desktops window, select Session tab, you will see option “Forward printing devices”. If the remote desktop connection has been added, right click the connection and click Edit. Select Session tab, you will see option “Forward printing devices”.
No Printer Connection to Remote Desktop Computer (Mac-Windows): https://social.technet.microsoft.com/Forums/Lync/en-US/43653267-22cd-4c8e-be25-39a70339c9bc/no-printer-connection-to-remote-desktop-computer-macwindows?forum=winRDc
4.Printing in MAC using remote desktop connection: https://social.technet.microsoft.com/Forums/windowsserver/en-US/c444c2e2-5bca-4ebc-b6bc-10daac65435c/printing-in-mac-using-remote-desktop-connection?forum=winserverTS
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