LNbits over Tailscale will not gonna work. Tailscale is a private VPN IP, that means it cannot deliver https over internet (that LNbits require).

If you want to make your LNbits accessible on internet use the caddy or nginx options. See the LNbits documentation page for further instructions. https://github.com/lnbits/lnbits/wiki/LNbits-Documentation#additional-guides