Getting unsupported in xbrowser for maxlength

I am trying to verify that the maxlength of a field is set to a certain value. When I call it from workbench using the get property from control and setting property to maxlength, it tells me that maxlength is not supported from xbrowser.

I used the .getproperties() and maxlength is in the list. I created a script to loop through the results of .getproperties() and passing those into the .getproperty() and it works for all the properties except for maxlength.

btw, this is in ie11 and the app only supports ie.

HELP!