Not everything that is represented in Dorico is currently included when exporting MusicXML files, I’m afraid, @mpatkinson321. You can read about the state of MusicXML export in Dorico in this thread:
The thread is four years ago now, but I’m sorry to say that at this stage the list of things missing from the export is still pretty similar to what I wrote back then. We do intend to dedicate some more time to improving MusicXML import and export, but I’m afraid it’s not yet risen to the top of our priority list.