Just installed:
Plugin Version: 3.6.9 (API Version: 2.23.5)
Google-Account datas are correct. No double login (2-step-verification) enabled. I followed the constructions from https://www.nextscripts.com/blog/nxsfaq/how-to-unlock-google/
and I get the error message after test posting:
Array
(
[pgID] =>
[isPosted] => 0
[pDate] => 2016-08-21 11:15:34
[Error] => Login/Connection Error: Can’t login. Two possible reasons: