No entries. I just tried adding "listen=1" but then deleted it.
EDIT:
My router also has UPnP enabled and I've tryed to check the "map ports with UPnP" in the GUI, on options, without any result
Would you mind to try to put listen=1 again under bitcoin.conf file but this time after you save it reopen bitcoin core and reboot the PC so that the config after restart will load.
Also, if your router has anti-DDOS enabled I suggest disable it to try.
Set up your PC network switch to static then add Cloudflare DNS to try.