didn’t work for piped.video and yewtu.be. which front end are you using?

+1 on this. it look easy from outsider perspective until you are in that shoe and feel how much courage/skill it need to say no.

high speed low drag

you may try this: 1/make sure jellyfin is actually running and there is no error in logs and firewall is not blocking inbound connections

2/double check LAN IP/port jellyfin service running on and make sure the device you want to connecting to jellyfin can reach that IP (simple icmp ping is a good start)