The AFElement.FindElementsByExtendedProperty Method does not support search of String Array Type Property.
Please find below the Remarks from the help file
"This method will find the elements that have an extended property with the specified propertyName and its value set to one of the values in the list of specified values. All extended property values of type String and Guid on an AFElement are automatically indexed in theserver to speed up the search on these types of property values. These are the only type of property values that can be searched. The QueryDate of the specified database will be used to determine the collection of elements that are returned from this method. "
Is there any other way to Search ?
Thanks in advance