Oracle has 2 very strict firewalls. You have to open ports from the oracle Web interface (mandatory) and maybe also set rules on your VM.
this post was submitted on 18 Jun 2023
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Yea, its sometimes annoying when you have to manage 2 firewalls (still to this day i find the Oracle interface too messy), but it makes it secure
You didn't say anything about firewall or security list, so did you add rules in the subnet security list of your instance and did you open ports in iptables to allow incoming traffic on NPM port?
See this blog post for more details : https://blogs.oracle.com/developers/post/enabling-network-traffic-to-ubuntu-images-in-oracle-cloud-infrastructure
None of those IPs are public so when someone external comes asking for the public IP 129.159.x.x the server will respond that it doesn't have any service running in that IP. When the service is listening to the tailscale interface and you access it through tailscale, your browser is asking the server for the content on 100.64.x.x, the tailscale IP, and so there is indeed a service on that IP. So if you want to provide a service on both the tailscale network and through the public IP, you have to use the IP 0.0.0.0 which means every interface or you can also tell nginx to listen on both the public ip and the tailscale ip. And as the other comment says, you have to allow the port connection in bot the VPS and the Oracle network, the VCN.