Jellyfin Letsencrypt proxy-conf

Has anyone gotten proxypass to work for Jellyfin? I use subfolders and can’t get it to work at all. I’ve even tried copying the emby proxy-conf subfolder just in case it has some legacy pointers or something. No dice.

This is the subfolder config we supply with our LetsEncrypt container:

In theory it shouldn’t be any different to the emby one.