[V-2]

Works fine on Vivaldi (which is Chromium-based), unless the error is only supposed to occur after an actual logging attempt, which I can't test without an account.

So I don't doubt there's a limitation, but it doesn't seem to disallow every derivative browser (assuming I'm not misunderstanding you somehow).

[jorgemf]

Vivaldi workarounds these kind of issues by identifying itself as chrome. When a site blocks vivaldi because it is not chrome the site is added to a list and it will identify itself as chrome in the future (I know because it happened with the web version of whatsapp).

[grishka]

It's actually a whitelist. Vivaldi always uses the Chrome user agent, unless it's a website known to not block it, like vivaldi.com, and probably some of their partners too.

[jorgemf]

I though it was the opposite, I guess WhatsApp was doing something weird to detect Vivaldi. Do you know how they solve it?

[grishka]

No idea tbh. I haven't used WhatsApp for several years and deleted my account a year ago.