version 10.7.2 for Mac broke the ability to connect to an RD Gateway. Rolling back to previous versions restores this ability.
lsorensewere you able to connect to a RD Gateway by downloading the most recent release of 10.7.1 as noted by willahlborn? (https://install.appcenter.ms/orgs/rdmacios-k2vy/apps/microsoft-remote-desktop-for-mac/distribution_groups/all-users-of-microsoft-remote-desktop-for-mac)