I’ve been working on an automated approach to installing the “AWS EC2 with subnet routes” instructions…
Based on some earlier work which is now out of date I have got something that works for me using --advertise-routes and --authkey as service creation in cloud-init:
The original author used Amazon Linux 2 for the 2 nodes, but despite updating
gnupg2 I could not get the instructions here to work: Download - Tailscale
So I switched to using Ubuntu 20.04.