VB add-in not able to create simple Cycle Count

Summary:

Cannot create simple cycle count via VB where REST via Postman works. And issue is with the subinventory.

Content (please ensure you mask any confidential information):

Already have a VB to create cycle counts where I am also passing count category and running complete sync. Also, a cycle count requires a subinventory so that tab also added. Both Categories and Subinventories are linked to CC Definition by Organization Code and Cycle Count Name.

That VB is working. But now tried with a cycle count that does not have categories or abc classification. And this does not work. Am using the same link in Subinventories tab but seems now it cannot find the appropriate count??!!