HTTPS via Cloudflare-Nginx-Jellyfin Question

[SammyD]

I'm getting closer to getting this working. I set up Nginx per instructions and aquired a certificate. Now when I try to connect I get a 500 Internal Server Error. My address shows as https://jellyfin.XXX.com with the https crossed out (not secure). I think I'm missing something in Jellyfin because I haven't changed anything there and HTTPS is not enabled and there is no certificate specified.