GHL appointment is not booking

I follow all instructions to integrate VAPI and GHL. Its create and find contacts during call with VAPI agent but It can't find available slots and book appointments. every time it said it said i dont have any slots even my time zone and slots are available in GHL account.

I attached SS of error that is should we it try to find slot and book appointment. Its shows 400 request error.

Please help me to solve this issue.
Thanks
Atta.
Screenshot_2025-08-14_at_9.01.54_PM.png
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