When I went to make a new notebook today it wouldn't let me and said I needed to sign in and sync my old notebooks. When I clicked the sign in button where the sync error was it did nothing, so I signed out and signed back in and when I got back into my account, everything was gone. It is no where to be found on OneNote or OneDrive. Theres nothing in my deleted notes and I can't seem to find it anywhere. It was two years worth of university notes and before I signed out it said they were backed up offline but I cannot find them anywhere offline. Any suggestions would be greatly appreciated.