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...