I am using Groove on my office pc and notebook to synchronize files. It
works perfect.

I invited a couple of my students to share my workspace. They have Groove
installed on their computers. If I search for them in Groove public
directory, their names appear. However we cannot share the workspace.

My students are waiting for my confirmation. On my end, there is no prompt,
or anything that I can do to confirm them. How do I add them?