Zoho Flow The expected input type is jsonarray Error Message

Zoho Flow The expected input type is jsonarray Error Message

Using Flow to create a CRM Lead when an appointment is created in Zoho Bookings.  I need to update the Product Category field in the Lead which is a Mutli Select required field.  Using Flow I am updating the Product Category field with the value - InstantAccept.  I receive the following error  - Zoho CRM says "Invalid input for Product_Category. The expected input type is jsonarray."

What is the fix?

Thanks
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