Stage 9 was a non-commercial, virtual reality recreation of Star Trek The Next Generation's Enterprise starship. It allowed fans of the series to explore the beloved vessel and immerse themselves in the chief setting of the series. It was built over the past two years using Unreal Engine 4 by fans who have taken great pains to state that the project was not affiliated or licensed with CBS or Paramount and that they weren't doing this to make money, only to artistically demonstrate their fandom. That did not stop CBS from sending a cease and desist letter, thus shutting down the project as CBS was reportedly unwilling to engage in dialog.
From Techdirt : CBS Bullies Fan Star Trek Project To Shut Down Despite Creators' Pleas For Instructions On Being Legit
and at Ars Technica : Amazing NCC-1701-D simulator issues final command: "all stop"
and at TorrentFreak : CBS Shuts Down Stage 9, a Fan-Made Recreation of the USS Enterprise
(Score: 2) by All Your Lawn Are Belong To Us on Tuesday October 02 2018, @10:02PM
Though you're not alone either. According to Memory Alpha [wikia.com] citing Whitfield's book Making of Star Trek, Roddenberry had to correct NBC of the same thought. Though the NX-01 Enterprise of the Enterprise series did not use "USS" - same MA article noted that it was pre-Federation therefore not United Space Ship, and gets into geekery about a ship pre that one that was.
This sig for rent.