I call the response as below:
https://docs.microsoft.com/en-us/partner-center/develop/get-indirect-resellers-of-a-customer
I tested a lot of data and the majority was successful, but When I use the CustomerId(90a73a9c-4585-4cbc-9987-0c38fa***3b9) the Return is null .
I could appreciate if someone can answer why have the situation ?