while delta chat supports oauth2 for a while, google decides some time ago that an “additional client verification” is needed. we applied to this client verification, however, unfortunately, the first attempt failed for unknown reasons and “simplified setup” stops working.
we’re currently trying hard to get in contact with google about this issue.
meanwhile, as a workaround, if you want to use gmail with delta chat, you can do this as follows:
- enable “less secure apps” in your google account at https://myaccount.google.com/lesssecureapps . if you have two-step-auth enabled for your google account, you have to create an app password instead.
on a new delta installation, when being asked about “simplified setup” after entering the email address, answer “cancel”. then enter your gmail password.
on existing delta installation, go to “profile / account settings” and change “advanced / auth method” to “automatic”. then enter your gmail password.
this does not affect oauth2 in general, only google. eg. yandex oauth2 is working as always.