Hi Chee,
Your information is incomplete. Besides deleting "/Applications/OneDrive for Business.app/", the following also needs to be deleted:
- Link to the OneDrive folder in Finder's sidebar
- The OneDrive folder, if the files aren't needed anymore
- ~/Library/Application Support/OneDriveBusiness
- ~/Library/Logs/OneDriveBusiness-*
- System Preferences > Users & Groups > Login Items > OneDrive for Business
Could you please tell me if I've missed anything?