I am experiencing the same issue since yesterday. Keep saying my computer has no Internet Connection after scanning QR if I am opening whatsapp web via Brave.
It is working just fine with other browser.
As unbelievable as it may be, disabling Honey did the job for me.
I tried clearing up history/cookies, clearing the WhatsApp cache on my phone, tried incognito, disabling shieldsā¦ For a minute, I thought Iād have to use Edge.
Luckily I found the answer here, but seems really weird to me.
It was Keepa for me too!
Does anyone have any trick how to fix this?