Link to authorise Onedrive access goes nowhere

I’m trying to change my external backup from Dropbox to Onedrive. Updraftplus generates a notice reading “Follow this link to authorise access to your Microsoft OneDrive account (you will not be able to backup to Microsoft OneDrive without it).” but clicking the link simply brings me back to the UpdraftPlus tab on WordPress. Does anyone know how I sync UDP with Onedrive? Is it only possible with the paid version?

Thanks in advance.
Alan