To get the Tenant ID of your Zuora tenant, please navigate to the Username > Profile > Manage Your Profile.
Note : The above procedure works only with standalone tenant and if you have multi entity enabled you must use API call to retrieve all the tenant information. Please refer the below article for more details.
https://community.zuora.com/t5/API/Zuora-querying-apis-permissions-issue/m-p/26076
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