A Microsoft file hosting and synchronization service.
Hi Kelvin,
Since the same symptom can be caused by different reasons, to clarify your scenario, could you confirm the following info?
1.Confirm whether you have tried the troubleshooting steps in the thread, and then share the outcome.
2.Check if you use the latest version of OneDrive (17.3.6386.0412)
3.Go to the registry editor to check the DefaultToBusinessFRE.reg and EnableAddAccount.reg . To check it: Right click Windows icon on the lower-left corner>RUN>Input Regedit> Go to the path: HKEY_CURRENT_USER\SOFTWARE\Microsoft\OneDrive
Moreover, for further investigation, I'd like to collect your tenant and OS info via Private Message at https://community.office365.com/user/conversations?
Please share updates when you have time.
Thanks,
Felix