I ranted about this before, tailscale doesn't allow you to signup with your own username/password, they expect you to use google/facebook/microsoft accounts (or bring your own OIDC server, which is overkill if you are an individual user). As someone who got his google account blocked and got locked out of half of the internet, I can only warn anybody from ever using 3rd party logins.
Have you seen headscale? It's a bit of work if you don't have a selfhosting setup but it enables you to use the service without being at the whim of Tailscale.