Hi Ping, Thank you for reaching out. ManagedCustomerServiceError.CYCLIC_LINK_NOT_ALLOWED indicates that you are attempting to create a cycle in the hierarchy. This action is not allowed as having a linking cycle in the hierarchy might cause concurrency issues. You could understand it as when you make one call from the manager account, you might encounter the situation that more than one call issued to the same client customer account due to multiple routes in the hierarchy.
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