If you want to access your unraid server over tailscale at this point you are better using the plugin.
Unraid Tailscale Plugin
I will continue to update this for thos using tailscale to, for example, connect groups of docker containers on private networks into tailsacle.
Please use the plugin otherwise, use for direct access to unraid is considered deprecated, support will not be provided by me.
This is the support thread for deasmi/unraid-tail