PartnerCenter.Exception 'Unauthorized access' using app authentication

Question

So I am using the Peek CSP Billing example to do custom billing for our CSP clients. I had this working using app+user authentication, but since, I have had to update the dll's which caused the solution to no longer work. As we are not yet ready to do secure model, I wanted to switch to app authentication. It is failing on partnerOperations.Customers.Get() call.

Here are my excerpts:
AuthenticationHelper.cs

        public  IAggregatePartner GetCAPartnerCenterTokenUsingAppCredentials()  
        {  
            IPartnerCredentials partnerCredentials =  
                PartnerCredentials.Instance.GenerateByApplicationCredentials(  
                    this.Configuration.ApplicationAuthentication.CAApplicationId,  
                    this.Configuration.ApplicationAuthentication.CAApplicationSecret,  
                    this.Configuration.ApplicationAuthentication.CAApplicationDomain);  
  
            // Create operations instance with partnerCredentials.  
            return PartnerService.Instance.CreatePartnerOperations(partnerCredentials);  
        }  

Then in my CspUsageController.cs I have:

            var partnerOperations = this.authHelper.GetCAPartnerCenterTokenUsingAppCredentials();  
  
            SeekBasedResourceCollection<Customer> customersPage = partnerOperations.Customers.Get();  

I have registered my Native App in the Partner Center. This also is shown in the AAD app registrations which I have given the app API permissions to Access the Partner Center.

I have confirmed that Customers.Get() is supported by app authentication. Why am I still getting 'Unauthorized access' ?

I know this is not a user, but where can I assign App Registration permission to the Partner Center API?

Answer 1

Hi obsajenns,

Please use the Web App's Client Id and Secret instead of Native App in Partner Center:

Then it's available to execute Customers.Get():