A Microsoft file hosting and synchronization service.
Dear Rod Bergen
Good day! Thank you for posting in Microsoft Community. We are happy to help you.
Based on your description, it seems that you want to migrate all files from OneDrive Personal to OneDrive for Business. But when you use app.mover.io web app to do this action, it seems that some files are missing.
In this scenario, first, we recommend you back up your files to avoid data loss before moving files to OneDrive for Business. You can save to other location, such as your local drive.
Then, we suggest you re-moving your personal files to business via the steps in below article
And noticed that: If you’re moving a large number of files, we recommend that you move files in batches of no more than 100 files each.
If the scenario above is not consistent with yours, you can also post back and point that. We’re looking forward to your reply and will continue to help you all the time!
Your understanding and patience will be highly appreciated. I hope that you are keeping safe and well!
Sincerely,
Stacey | Microsoft Community Moderator