Hi Matthew,
For the OneDrive for Business on Mac problem, could you help us troubleshoot the problem first? We’d like to confirm the following points:
1. Please try to add some files to the OneDrive for Business synced folder on your computer, then check whether the files can be uploaded to the OneDrive for Business online library.
2. Check whether you have the ‘Repair’ option, if you currently are able to have the Repair OneDrive for Business when right clicking the icon, please try it and let us know the results.
3. Click Preferences > About > Unlink OneDrive for Business to stop the sync, and recreate the sync to that same library to check if there’s any update.
Please feel free to post back with any updates, we will provide further help. You can provide more details such as the screenshots. To upload screenshots, click Use rich Formatting in this thread and select nsert/Edit Media.
Thanks,
Elaine