For everybody who stuck on a connection step to your friend's server
There is a Window Defender step thing where you suppose to allow your Aki.Server.exe and EscapeFromTarkov.exe, I don't know, but somehow when your create those inbound rules in Window Defender it doesn't automatically change to green color (allow rule), instead it automatically changes to red (not allowed)
So make sure to re-check your allowance of those files again, make them green and then start the server again!