Hi, This seems like this issue is related an internal error with refreshing the access token. In general, if access tokens cannot be refreshed, you should try again after 30 seconds. If this does not work, you should try to do the OAuth2 flow again and get a hold of another access token.
In your App.config file, try setting: <add key="RetryCount" value="3"/> If that still does not work, I suggest seeking the help of this forum <http://www.google.com/url?q=http%3A%2F%2Fstackoverflow.com%2Fquestions%2Ftagged%2Fgoogle-oauth&sa=D&sntz=1&usg=AFQjCNHPsLHSYfLav5BsOd2R8w0Bm6tI-A> . Cheers, Anthony AdWords API Team -- -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ Also find us on our blog and Google+: https://googleadsdeveloper.blogspot.com/ https://plus.google.com/+GoogleAdsDevelopers/posts =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ You received this message because you are subscribed to the Google Groups "AdWords API Forum" group. To post to this group, send email to adwords-api@googlegroups.com To unsubscribe from this group, send email to adwords-api+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/adwords-api?hl=en --- You received this message because you are subscribed to the Google Groups "AdWords API Forum" group. To unsubscribe from this group and stop receiving emails from it, send an email to adwords-api+unsubscr...@googlegroups.com. Visit this group at https://groups.google.com/group/adwords-api. To view this discussion on the web visit https://groups.google.com/d/msgid/adwords-api/2a9ccac0-2018-4aef-b1b9-e528e4adb9b3%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.