This issue started yesterday. It was a very strange authorisation issue that the team believe they've fixed for Windows (currently working on MacOS and Linux)
MuseHub PSA:
I've been away at a conference the last few days and just learned that MuseHub has been down since Friday. I understand the hub team just fixed the issue for Windows but MacOS and Linux are still being addressed. Please share with any MuseSounds users you know.
This is an issue with the MuseHub that started on Friday. The team believe they've just fixed it for Windows (testing underway but you can check). They're are now focused on MacOS and Linux.
Really sorry about this. It's a big lesson for us.