/PUT Integration in Multiple Node Instance - Returns 400

I have this Process model with Multiple Node Instance.
Multiple Node Instance

That runs the Integration with PUT Method
PUT Method Integration

The problem is when the process model starts, the instances returns 400.
MNI Result

I tried testing the PUT API in the Integration and Postman and it both works fine.

Can you help me, what's the reason why it's not working in MNI?

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