Are you using some Apple or MS author account?

Google and Github SSO were the only options when I originally setup tailscale. There are a few more options now including what looks like every self-hosted OIDC provider I’ve ever heard of, and a few I hadn’t.

How did you config tail scale though?

There are a couple options depending on how you are using it. Most of the time I just use the tailscale command to configure each node.

Most systems were just sudo tailscale up --ssh to get it up and running, although I have one system setup as a subnet router to give me outside-the-house access to systems that I can’t put tailscale on. That was a little more involved but it was still pretty straightforward and well documented. Their documentation is actually very well written and is worth the read.