binding column of type bit in update query

In this setup, the name column (type is nvarchar(50)) updates just fine.

I cannot get the two other columns (IsFrequentlyUsed & IsActive , both of type bit) will not update.  

I have confirmed that their values are passed in correctly and I have tried to convert them to 1 or 0 as well.  In any case, they do not update.  Is there some consideration for bit type columns in this setup?

$sql = "UPDATE Color 
		SET
		Name =?,
		IsActive = ?,
		IsFrequentlyUsed = ?
		WHERE Id=?";

$params=array( &$Name, &$IsActive,&$IsFrequentlyUsed,&$Idin);

$stmt = sqlsrv_prepare( $conn, $sql, $params, array("Scrollable"=>"buffered"));

if(sqlsrv_execute( $stmt )){

	//query succeeds
	

}else{

	//query failed
	
}

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