A Microsoft file hosting and synchronization service.
Based on my research and understanding, the "Secure Folder" havoc you are seeing on your laptop and desktop may cause by a device-level gallery integration linking to a personal Microsoft account. When this integration is active, it creates specific folders in your personal OneDrive that automatically sync down to any Windows PC linked to that account. Additionally, when the Android OneDrive app gets stuck trying to sync both work and personal credentials, it can prevent you from removing the accounts normally.
Here are some recommended steps according to my testing on my Android device and I hope it helpful:
Revoke "Secure Folder" / Gallery Access from your Microsoft Account:
To stop the device from forcing Secure Folder and personal files into your OneDrive and pushing them to your PC, you need to sever the connection from your Microsoft Account settings.
- Go to your Microsoft Account privacy page: https://account.microsoft.com/privacy
- Sign in with the unwanted personal Microsoft account.
- Scroll to Apps and services that can access your data (or click Apps and services).
Unlink the Unwanted Personal OneDrive from your PC to stop that unwanted personal account from creating havoc on your desktop/laptop.
- On your Windows taskbar (bottom right), click the OneDrive cloud icon. (Look for the white/grey icon, which is personal; blue is your work account).
- Click the Gear icon (Help & Settings) > Settings > Go to the Account tab and click Unlink this PC.
- Once unlinked, the syncing will stop. You can then safely delete the unwanted personal OneDrive folder from your computer's File Explorer. Official Documentation: Unlink and re-link OneDrive - Microsoft Support
Reset the OneDrive App on Android
Since the Android app isn't letting you remove the accounts manually, we need to reset the app. This is the Microsoft-supported way to clear out stuck cached credentials. (Note: This will not delete your files in the cloud).
- Go to your Android Settings > Apps > App management > User
- Tap Storage > Clear Data (and Clear Cache).
- (If you prefer, you can also completely uninstall and reinstall the OneDrive app from the Google Play Store).
Sign in with Work Only
Now that the integrations are severed and the app is clean, open the OneDrive app on your phone and sign in only with your OneDrive for Business (Work) account. If it prompts you to turn on Camera Upload, decline it, so personal photos stay off your work drive.
I hope this information helps and please let me know if this successfully separates your accounts or if you need further assistance!
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