Hi Ankit,
Thank you for reaching out. UserListError.ADVERTISER_NOT_WHITELISTED_FOR_USING_UPLOADED_DATA error occurred as your account has not been whitelisted for mutating CrmBasedUserList. You could contact your Google account representative to get your account whitelisted for this feature. Please let me know if you have any further questions.
Thanks and regards,
Xiaoming, Google Ads API Team
Hi Ankit,
Thank you for reaching out. Our team is only focused on the Adwords API/Google Ads API related issue. We suggest you log into your manager account and navigate to the ? -> Get help and reach out to the product team to figure out who has been assigned as your Google account representative.
Thanks and regards,
Xiaoming, Google Ads API Team