Ran out of room in the edit comment field. Adding some source references here:
"The entire game on PS4 and Xbox One can be played with a friend beside you in split-screen couch co-op or online with a friend. Note that split-screen is not available on PC." -- Official FAQ
"Local Co-Op: Not Supported Online Co-Op: 4 Players Combo Co-Op (Local + Online): Not Supported LAN Play or System Link: Not Supported" -- Co-optimus
Tried to include links to the sources but kept getting CAPTCHA prompts endlessly and it would not save unless I removed the links.