You are using a VPN and you have not used Force and Bind IP in the F12 settings. You put your own IP in there, without a protocol, e.g. 26.25.41.42 
You are port forwarding but you have not done it correctly, 
You are port forwarding but still enabled UPnP 
You have enabled UPnP but your router does not support it 
You have not allowed EscapeFromTarkov.exe in your Firewall on both Public and Private networks 
You are running a mod that breaks loading into the game 
I checked all notes here and my friend isn't able to join my lobby.
i was able to join his lobby but the ping was too high.