MAS version of OneDrive will not open on macOS Tahoe Verrsion 26.5

To switch from the Mac App Store (MAS) version of OneDrive to the Microsoft standalone version on macOS Tahoe, remove the Store app first, then install the standalone build.

Follow these steps:

1. Uninstall the Mac App Store version of OneDrive
   1. Quit OneDrive if it is running or crashing in the background.
   2. Open Finder > Applications.
   3. Locate OneDrive (this is the MAS app).
   4. Drag OneDrive to the Trash.
      • This removes the app; files in OneDrive are not deleted from the cloud.
2. Clean up if OneDrive does not start or behaves incorrectly If OneDrive still appears stuck or won’t run after reinstall, reset it:
   1. In Applications, find OneDrive (if still present).
   2. Right‑click OneDrive > Show Package Contents.
   3. Go to Contents > Resources.
   4. Double‑click ResetOneDriveApp.command (or ResetOneDriveAppStandalone.command if present).
   5. After the reset completes, remove the app from Applications as above.
3. Install the standalone OneDrive sync app from Microsoft
   1. Go to the Microsoft OneDrive download page and download the latest OneDrive for Mac standalone app (not the Mac App Store version). A direct link is provided in the documentation: download the sync app.
   2. Open the downloaded installer and complete setup.
   3. Start OneDrive (Spotlight: press cmd+Space, type OneDrive, press Enter).
   4. Sign in with the OneDrive account and complete configuration.
4. Ensure only one version is installed
   • Only one version (Store or standalone) should be installed and configured at a time; running both can cause crashes and sync errors.
   • If any older or duplicate OneDrive app remains in Applications, move it to Trash so only the new standalone app is present.

This sequence removes the MAS build and replaces it with the Microsoft standalone version, which is the recommended configuration when the Store build is failing.

References:

• Why do I have two versions of OneDrive on my Mac?
• Fix OneDrive sync problems on Mac
• Manage files and folders in OneDrive
• Reinstall OneDrive
• OneDrive isn't running
• OneDrive for Mac failed to launch after update - Microsoft Q&A