After selecting a game mode, it takes the usual amount of time for finding a game, but after the message 'PREPARING SERVER', the notification 'UNABLE TO FIND GAME' follows.
This issue has occured before, but after restarting the game it would disappear, not this time.
All drivers are up to date, I checked anti-malware software and firewall settings and checked game file integrity, reverted back to older Nvidia drivers and tested those, did not work either. Changing match preferences changes nothing.
EDIT: The issue was related to my router, I was able to fix it by adjusting firewall settings there instead of Windows Defender.