Hmmm.. I have heard of PCs not allowing people to get on certain games before, so it wouldn't be too much of a surprise. The best way to test to make sure that it is the PC and not anything else would be to use another computer to test, but as you said you are unable to do so because of the files on that other laptop.
Do you happen to have a friend with a laptop that would be willing to come over and let you test it out on their laptop? That way if it doesn't work, then it is an issue with either the FH servers or it is an issue with the internet. If the laptop does work, then it would be a hardware issue.
Do you have anything installed for the game? Mods, presets, etc.? It would be a long shot but maybe that could be an issue. Also, probably a question that we should've asked in the beginning. Are you using a Mac?
Lastly ~ From looking at Opera it does have VPN and Ad Blocker integrated into the software. You may have already tried this, but have you tried using Chrome or an alternative browser? I know that generally, Chrome is the browser with the least amount of issues for this game!