I tried all suggestions already, there IS a problem - or at least there was when I commented.
I DID REMOVE MY PERSONAL VAULT IN THE END THO.
I'd already emptied it, and had to unlock it every time before synching would even start (NOT acceptable behaviour, YOU NEVER CLEARLY ALERT THAT SYNC IS DISABLED) but disconnecting this device from OneDrive and reconnecting fixed it. I'm sure I'd tried that before, but I was moving from one laptop to the other so this may have been the first time One Drive had NO devices connected to it. I dunno. Maybe MS fixed their mess in the meantime.,
I'm almost certainly moving to Linux and my existing Google Cloud, Microsoft have zero discipline or rigour, I'm in my 38th year of writing code for a living, recently moving to full stack C#/Razor from Java and Microsoft are the WORST for destroying common sense - an extremely experienced C# guy I followed while upskilling published an article on Medium lamenting that C# is now so confusing with "5 ways to define a variable" and many many examples where there are now countless ways of doing everything, and he's right, it's so bad that when I asked Claude Code to reformat a class I was no longer able to understand it.
Every method became a nightmare of lamdas or something because apparently there's 300 ways of defining methods too. Microsoft don't have standards. Only half of your devs will be able to maintain the old parts of your code base, and the other half who won't be able to do that will be writing new code the older devs can't maintain.
That's the most irresponsible thing you could ever do to a language, and this absurd Personal Vault thing just adds to my increasing concern that one day, possibly very soon, it will all unravel.
Yeah, Linux is looking GOOD - especially for gaming. Microsoft making MSi replace the right control with a CoPilot AI button is the last straw for me. Let us CHOOSE to use CoPilot, forcing it on us is putting AI adoption back a decade.
They've gone from 'Where do you want to go today?" to "HERE'S WHERE WE'RE TAKING YOU TODAY AND WE'RE UPLOADING SCREENSHOTS OF THE JOURNEY WHETHER YOU LIKE IT OR NOT" 😥