Error 1200 OneDrive

AtanasM I have similarly been struggling with this for over a month with little success until today. If you are connecting to a 'work or school' account, it looks like you need to log into admin on the Office 365 portal, go into Azure Active Directory Manager, find the device name in Devices>All Devices, delete the device from the Azure AD, then on the PC go to windows account>work and school and disconnect the account. Once everything is disconnected, add the account again. Not only did that fix the specific account that I was reconnecting, but another work/school account on a different domain that was also not working on this computer reset itself during the procedure and asked for the password - this account then worked too. Let me know how it goes.