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.ts.net name: open the Tailscale app on your phone and make sure it is connected, signed in to the same account as the server.Use the user name and password you log in to that computer with. On a Mac, that is your Mac account, not your Apple ID.
Turn on "My server doesn't allow passwords", copy the key shown, add it to ~/.ssh/authorized_keys on the server from a computer that can already log in, then tap Connect.
Install tmux on the server (brew install tmux or sudo apt install tmux) and keep "Keep sessions alive" on for that server.
If you rebuilt the server, open the server's settings in v-Shell and tap "Forget server identity". If you didn't, don't connect: someone may be intercepting the connection.
Settings > Restore purchase, signed in with the same Apple ID.