Access Jellyfin with my Smartphone remotly through Internet

[TheDreadPirate]

Maybe? I have no idea how your router works, but it's worth a try. And that looks like the correct address.

[Herojak]

So I just tried some things with the ipv6 address and it was simpler as i thought because I dont need to portforward anything or use Host Exposure.
I typed in the ipv6 address of the ds223j and it worked even outside my network:
http://[2a02:.....:a56h]:8096/

Thank you for your help even if it was not solved directly because of you.
It was a lot easier to solve the problem with some help

Best Regards from Germany