Solved
Does Apex Legends use P2P?
There is a security gateway with network IPS feature that blocks P2P traffic in my home. However, when playing Apex Legends with PC on the Taiwan server, I sometimes encounter a block on "ET P2P Edon...
From what I've heard, Apex doesn't use P2P so I'm not sure why you're getting this warning.
As far I'm aware there isn't a "fixed list" that has been published, though if I'm correct you can find some of the IP's in the temporarily generated netcfg file that can be found in this directory: %userprofile%\saved games\respawn\apex\assets\temp\
