Hi Erin,
Anyway you found the work around to solve your problem.
You can try one more time which you have done the filter Xpath with the prefix namespace of your nodes. In every xpath of filter you didn’t mentioned about the prefix of node. Filter will work whenever our xpath is correct otherwise it displays nothing.
You can try the below filter once and could you try more xpath’s of related this one.
id = current()/d:group/MasterID
Or
id = current()/d:group/d:MasterID