Last I checked, Roku doesn’t have a Tailscale app. So unless Tailscale is working on your router the TV can’t see the laptop’s Tailscale IP.
I have a similar setup, and Roku only works if I connect to Jellyfin with the LAN IP. If your laptop isn’t on the same LAN – wifi or ethernet – it won’t work.
Maerman@lemmy.world 3 weeks ago
Tailscale creates a new virtual network, and anything you want to connect to the Jellyfin server needs to be in that Tailscale network. You need to hook up the Roku device to Tailscale. I have never owned one, so I can’t say anything about that. But maybe that’s what you should figure out next.