I’m assuming this has been on 2.0.6.3 for awhile, you haven’t been changing things, and it just broke.
MEGA is typically non-receptive to use by software that’s not their own, and likely won’t help with that.
is the definition in the third-party library used, and it sounds pretty broad. Is your login still working?
Does MEGA provide ways to see Duplicati files? Are they present? Does Test connection work?
That’s typically a file listing that doesn’t care about the files seen, but your failure is a file listing too.
was the known caused-by-MEGA-change problem that the new lib fixes. Maybe it fixes this too?
So there’s another option. Release: 2.0.6.105 (canary) 2023-04-09 seems to be testing out well.
Canary is pretty untested at first release, so long term one might prefer Beta, when it comes out.