Friend can't connect to servers

My friend just installed Tower Unite once again, last time we have played must have been a couple months ago. He is unable to connect to any server including mini games, lobby and condos. Although the weird part is that he is able to host them himself. This issue is extremely aggravating as we have been trying to solve it all day by trying multiple different things which I will list below.

Summary:

  • Can’t connect to servers hosted by others
  • Can host servers himself
  • Gets past connecting to server then goes onto loading the map then crashes

Solutions Tested:

  • Check to make sure upnp is enabled
  • Disable firewall and AV
  • Check NAT type (it’s Open)
  • Verify Game Cache
  • Reinstall game
  • Port forward/triggering
  • Tested Dx10 and Dx11

Edit:
It worked randomly for him for like a week and now it just stopped working again. Any idea on what it could be, I don’t think it’s on his side as we tried everything.