Unless that auth key is an ephemeral auth key, Tailscale should stay logged in on that machine until the node key expires and it has to be reauthorized. You can set a key to never expire in the admin panel, though.
Thanks for the reply, the key has no expiry,
i ran this command
tailscale up --authkey:tsk-12345 --unattended
the tail scale was connected, next I rebooted the system, i get a message
“Tailscale authentication needed”
I am missing some thing
Since you are using a desktop OS you must login and use the GUI tools to setup unattended. installing the msi and configuring via script or remote shell is what’s broken; it needs that gui tool to run to store the settings.