How to use IF function to compare two dates and tick checkbox


I would like to use a IF function that test that when the date that the user input in a form in the Form sheet is the same is the date listed in the "Availability" sheet, it must tick the checkbox.

I am currently using this formula but get a "INVALID OPERATION" error. Both columns are 'Date' type.

The objective is to use it as a booking form where a report will show which dates are still available to be booked (the unchecked rows)


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