Unfortunately they weren't staying mounted. That was the problem. Only a few would mount, but then they would unmount. The others just wouldn't mount at all.
Thankfully after a few reboots and about 18 hours, it finally stabilized and now the only 'not authorized' alerts I'm seeing are for my Amazon (experimental) drives. As long as my google drives stay mounted, I'm happy.
Thanks for this latest 976 version!