By default, NordVPN does not allow users to connect to Tailscale. This is because NordVPN blocks Tailscale traffic.

To solve this, you just need to execute the following commands:

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nordvpn whitelist add subnet 100.64.0.0/10
nordvpn whitelist add subnet fd7a:115c:a1e0::/48
nordvpn whitelist add port 41641

Then, restart the NordVPN connection:

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nordvpn d
nordvpn c US

Finally, if you are not connected to Tailscale, then connect to Tailscale:

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sudo tailscale up --accept-routes --shields-up