When you receive an email with an appointment (ICS), Lightning will show
you a blue "banner" to add the appointment.
In about:config it's necessary to have
calendar.google.enableEmailInvitations = true
to have direct write access to Google Calendar via invitations.
Unfortunately, after pressing the button in the blue banner only a
selection of possible calendars that he considers "worthy" is shown.
Although I have two calendars of the same account using Provider for
Google Calendar (once the main calendar and an additional one), only one
of them is "worthy" of this function. (and a local calendar, which is
not the topic here)
Meanwhile I had read that it is because a calendar needs to be linked to
the e-mail account.
Unfortunately, the GUI offers only for the "worthy" calendar an e-mail
selection under right-click => properties (there I cannot select an
e-mail for the target calendar, the option is simply missing).
therefore I tried manual setting of
with the ID of the email account, but this brought no change.
Does anyone have any idea if something else is linked or activated