Hi James, Have you followed this instruction <https://developers.google.com/adwords/api/docs/guides/authentication#configure_and_use_a_client_library> to generate refresh token using an MCC account?
Other things you can check are: 1. Make sure your server's clock is in sync with NTP. 2. There is a maximum of 25 refresh tokens that can be valid at a time. If someone gets a 26th refresh token, then the 1st refresh token becomes invalid. Thanks, Yin, 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/de4279d7-1f85-4c5b-a488-234c439802da%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.