Tailscale - vhat am I doing wrong?

[SOLVED] People of Lemmy. I'm trying (and failing) to get a friend onto my Tailnet. These are the steps: (1) I send them an invite. (2) They accept it. (3) I approve it. (4) They open the app and login. And ... nothing. They don't show up as connected on my admin panel and they can't access any of my connected machines (IP address is fine). I feel like I'm missing something really obvious but can't see what it is. Any ideas?

EDIT: All fixed. Needed to share machine directly, but this doesn't work for regular users. Once I deleted them as a user and then shared it was all good. Thanks everyone!