@SokeJWDK, this may mean that my previous step is required. Before deleting the folder, I'd already removed any trace of my work account from the Registry.
I'm no longer getting the notification, even though the Business1 folder was recreated. Also, while the Business1 folder was recreated, the corresponding Business1 key in the Registry (HKCU\SOFTWARE\Microsoft\OneDrive\Accounts\Business1) is all but empty, and the folder seems to contain only default configuration files.
My guess would be that the Business1 folder does correspond to the work account, and both the folder and the traces of the account in the Registry need to be deleted to suppress the messages. Continuing my guesses, OneDrive may require a work account to be present, and creates an empty/default/dummy work account if absent.
So that would mean that the steps to get rid of the notification are:
- Quit OneDrive and all SharePoint processes.
- Search the Registry for references to the email address/domain associated with the account, and delete everything that's not there for a valid reason.
- Delete the BusinessX file system folder associated with the account
After this, if you don't have a work/school account, OneDrive will probably recreate a dummy Business1, which does not produce the notifications.