Hi,
I'm developing an integration with Adwords API using .NET client library in the latest version (23.5.1), but when I call the method TargetingIdea I receive the error UNEXPECTED_INTERNAL_API_ERROR.
I created to accounts to authenticate de request, the first is an admin of Adwords Project GSuite, the second is a test account, both have the same domain and belong to the same organization. I'm using the developer token generated in admin account and the PrnEmail and Client Id from test account.
The data passed on request is the same of the documentation provided
here, the only difference it's the content of tag <searchParameters>, I did the request usgin both versions distributed in .NET library (v201802 and v201806) and I received the same error.
Here is the request captured with Fiddler