Hi David. I've met with this issue too. As I understand clients in Sandbox have own client ids. I didn't found method in v200909+ versions how I can get them. I've changed my code to use CAMPAIGN_ID for the Entity ID in Sandbox mode.
If this change is too doable for you take a look on http://code.google.com/intl/ru-RU/apis/adwords/docs/developer/AccountService.html This method can help you. Regards, -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ Also find us on our blog and discussion group: http://adwordsapi.blogspot.com http://groups.google.com/group/adwords-api =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ 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