Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
I now went to my OneDrive SharePoint site by the browser, and found that this site supports Office 2013 only. If you ask the site to download Groove as Sync client the "GrooveRetail" it downloads is an older version than that which came with the Office 2016 apps.
Thus, the problem is an incompatibility between Office 2016 and SharePoint 2013 and cannot be resolved by doing anything else on client's side than installing a Groove 2013 client. But Office 365 won't allow you because the individual components no longer appear in the Control Panel as separate items. The problem is the packaging of Groove into Office 2016 and release these apps without testing. Shame on Microsoft's Office product management.