Can't see the list in Import Setup (Step3)

[Juntaro7]

I tried following the guide on Step3: Import and Set up the Building Access app. At the import setup, i managed to link the SharePoint Connection but not the Office 365 Users Connection despite i tried to link OneDrive for Business, but in the list i won't be able to see it. The import button the bottom still display as greyout. Can anyone share some comments on how to get this work on please?