[Problem] Finding a match and player list won't work

It’s me again following the same tutorial. well i’m not sure if I’ve missed 5 videos but when i do multiplayer in a pie tab like in the video below for some reason i can’t find a match on the client preview. where the server is hosted on the server preview. also the players list which i made doesn’t do anything as it doesn’t appear. so i’m truly confused here.

Video: Blueprint Multiplayer: Player Card Setup | 16 | v4.11 Tutorial Series | Unreal Engine - YouTube

I’m not posting any screenshots since i would have to screenshot like 500 blueprints and also i’m not sure which blueprint is causing the problem/conflict.

same side question since it didn’t get answered: is there any good tutorials i can be linked to for making a third person to first person system, a health and combat system and a weapons system and making weapons work with the characters.