You may find that emails are attaching as OneDrive files. This feature is not supported on staff accounts. 4. For the option “For files I choose from my computer:” make sure you select “Always attach ...

Rip out Copilot: uninstall or use registry/script to stop background spying. Turn off ads, lock screen Bing wallpapers, and app promos in Settings. Disable OneDrive/startup apps, minimize telemetry, ...