Google blocks adding google account via KDE online account manager?
Yeah, I have the same issue.
And others seemingly too:
Could this have the same reason as what people (including me until I stopped using Kmail) experience with the KDE e-mail program Kmail and a Gmail account? Kmail is insecure according to Google and therefore you need and use a special code from Gmail instead of your own password to log in and get your e-mails.
Since Kinoite is probably more secure (in the eyes of Google) they let that slip by, but in the regular KDE version it doesn’t work.
Just an idea I have when I read about this.