Thanks for explaining your scenario. It seems that this issue is more on
the .NET client library as you mentioned that the C# object
has adServingOptimizationStatusSpecified field which is set to true
automatically, and this makes your request fail since if you are updating a
field in your campaign, you are not supposed to include
the adServingOptimizationStatus field. You can post this concern here
<https://github.com/googleads/googleads-dotnet-lib/issues> as the library
owners can provide further assistance in regards to this.
Also, if your main goal is to update different fields in your campaign, I
recommend that you only include the fields that you wish to update so the
request won't fail. You can refer to this example
includes the fields that can be updated.
AdWords API Team
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