I am unable to get the online scanner to work. I get this message every time I try. It's very vague and doesn't hint as to where to start looking. How to fix this?
It is maybe not pinned to your situation, but there is Knowledgebase article with some popular troubles for Online Scanner:
Also, there is topic about 'Online Scanner beta' (with some changes):https://community.f-secure.com/t5/Home-Security/Online-Scanner-beta/td-p/107596
Maybe good to try it! If trouble is still there with 'beta' -> possible to find reasons (after your feedback).