Andre, Ubuntu 16.04 LTS included evolution-dats-server 3.18. 3.20
introduced a major overhaul of Google oauth2 integration. So a fix in
3.28.3 is probably not going to be easy to apply to 16.04 LTS.
cement_head, I encourage you to upgrade to Ubuntu 18.04 LTS which has
many improvements in
https://bugzilla.gnome.org/show_bug.cgi?id=795997 is fixed in
evolution-data-server 3.28.3.
If your distribution does not ship 3.28.3 or higher you need to ask your
distribution for backporting the fix.
** Bug watch added: GNOME Bug Tracker #795997
