Login failed: Could not login: could not pre-login: unexpected end of JSON input

[Soukyuu]

Hi,

I installded goldwarden from AUR and followed the getting started guide up to the login step, but it just returns
Login failed: Could not login: could not pre-login: unexpected end of JSON input

I am running my own vaultwarden server accessible via tailscale only. The base URL looks like this: https://my.tailscale-subnet.ts.net/vw/ which is then handled by Caddy to forward to my docker container.

This is also what I fed goldwarden with:

$ goldwarden config set-api-url https://my.tailscale-subnet.ts.net/vw/api
Done
$ goldwarden config set-identity-url https://my.tailscale-subnet.ts.net/vw/identity
Done
$ goldwarden config set-notifications-url https://my.tailscale-subnet.ts.net/vw/notifications
Done
$ goldwarden vault login --email redacted@mail.com
Login failed: Could not login: could not pre-login: unexpected end of JSON input

My browser plugin can access and login to the server just fine, any idea what I am doing wrong?

Arch linux, up to date.