Google account configured in Fedora Online Account, doesnt works/syncro with google calendar. Other services like mail, documents, works fine. When you open Evolution, or Fedora tries to syncro your calendar, a window popup requesting your password appears on the screen.
Version-Release number of selected component (if applicable): Fedora 20 kernel 3.15.6-200 and Evolution 3.10.4. Gnome 3.10.2
That password request popup screen appears when you login in Gnome Fedora 20 and syncro your calendar with your Google account. By the way, opening Evolution (see your calendar).
A windows popup appears requesting our gmail account password.
Syncro the google calendar in Fedora/Evolution service.
I have exactly same problem, same versions also, problem started after I did an update.
I also have the same problem, with the same Fedora 20 kernel version, Evolution version, and Gnome version.
Thanks for a bug report. The problem is that the evolution-data-server 3.10.x doesn't support OAuth authentication against the Google server for CalDAV calendars, thus the token received by GNOME Online Accounts doesn't work, which results in the password prompt. The OAuth token support for CalDAV was added in time of 3.12.x development, thus this will be fixed in Fedora 21, which has 3.12.x evolution packages.