I think you mean "XA30" as that is the latest stable release. Siemens changed their DICOMs radically, with XA10, with more modifications with XA20 and XA30. You may want to try the development branch and see if this fixes your issue

You can get the latest compiled version of the development branch from appveyor:
  https://ci.appveyor.com/project/neurolab...
click on your operating system (win, lune, mac) and then choose 'Artifacts' for a compiled version.

If you have a Mac or Linux computer, you can build it yourself:

git clone --branch development https://github.com/rordenlab/dcm2niix.gi...
cd dcm2niix/console
make

You will want to be vigilant with XA30 - it introduces new features and we are rushing to catch up. You will want to heed the warning from dcm2niix to export as enhanced rather than classic DICOMs to get the full meta data. 

The SNUG Discuss - (Siemens Neuro User Group) is an excellent resource to hear about the opportunities and challenges associated with XA30.