I have the old OneDrive for Business (groove.exe) and new nextgen sync client (onedrive.exe) both instaled on my computer. But when I click the "Sync" button on my on-premises SharePoint 2013 site the Groove.exe does not startup up to configure the sync. Instead the OneDrive.exe starts up and prompts me to login. And of course when I do that it says I am already logged in and should sign in using a different account.
Any idea why Groove.exe is not starting up automatically? I am wondering if it's because I ran OneDrive.exe /takeover a while back and even though that should not change on-premises sync perhaps it's related?