Cannot add Tree Label when add tree node via REST API

Hi all,

I am able to add tree node to COA hierarchy by this API.

But I cannot add tree label in the request body, otherwise there will be error "The request content does not represent an action or it has an invalid structure."

If I did not add TreeLabelId in the request payload, when it's a parent value, the node can be created successfully with label field as blank.

How can I add Tree Label in this call?

{{baseURL}}/fscmRestApi/resources/11.13.18.05/fndTreeNodeOperations/action/addValueTreeNode

Request payload

{"treeStructureCode":"GL_ACCT_FLEX",         

"treeCode":"Bank Account AWX_COA",         

"treeVersionId":"0B31269674B6F09FE0635C601C0A7C2A",