SSRS - how to show and hide row based on new field on form.

Hi, I added a new field called "Mgmt approved" to the Orders page. This is simply a checkbox.

I have no idea what value CRM is passing for the Yes and No, if it's a 0 or 1, or Yes or No, or True or false...

Anyways, based on this value, I want the SSRS report to show or hide a row.

I added the row visibility expression in SSRS as

iif(Field!MgmtApproved= "Yes", true, false)

But nothing happens, can someone help? IS it possible the field is not coming over from CRM? Because the report output does not show the field being populated.