Hello Okasana, The CUSTOMER_NOT_FOUND <https://developers.google.com/adwords/api/docs/common-errors#AuthenticationError.CUSTOMER_NOT_FOUND> error is received when the ID specified in the request header does not exist. I see that you're using the CustomerService.getCustomers() <https://developers.google.com/adwords/api/docs/reference/v201710/CustomerService#getCustomers>, which will return all the customers directly accessible by the user authenticating the call. If the account specified is a new account, it is recommended that you wait a few minutes after the account is created before issuing requests against it. Could you please recheck the credentials used if they belong to the valid AdWords account user and try the request again? If you continue to have an issue with this, could you share us the email address used to authenticate the API call? Please use *Reply privately to author* option to provide the details.
Regards, Bharani, 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/6f2fb009-d064-4f4c-84c3-1e04b5986fbd%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.