Took me a while since I had to set up my presamp+moresampler again, but this is what I managed to catch:
Using the Teto English voicebank, I got the UST to play... Ish. My suspicion is that your UTAUs of choice simply lack the samples needed to play it, as can be easily demonstrated if you were to try to have an unmodified Defoko try to do something like '- geI'. Teto's English can do '- geI', but not Defoko.
Teto's English could sing some of the song, but some notes she just went mute on, because she didn't have it in her memory, how that sounded.
My best remedy for this is DIY, using the original UST to help with the notes.
Heck, any cover I'd do I'd build from scratch because I am very stubborn.
And deities forbid you try to make any ol' utau do Æ, Ø, or Å sounds, as a majority of the voice donors have no idea how to do it themselves.