Google has banned login through some browsers such as Linux, Konqueror, Falkon and Qutebrowser for security reasons. Although in some cases awaits clarification. It is not entirely said when the giant started keep blocking, it could be related to the Reddit’s post about the discovery of many dangers associated with those browsers.

https://www.techradar.com/news/these-linux-browsers-are-being-banned-from-google-services