To verify you are signed into OneDrive on Windows 10, locate the OneDrive icon in the system tray (bottom right corner of your screen). If it's a blue cloud icon, OneDrive is signed in and running correctly. If it's a gray cloud icon with a line through it, you are not signed in. Here's how to check and ensure you're signed in:

1. Locate the OneDrive icon: Look for the OneDrive cloud icon in the system tray (usually near the clock).
2. Check the icon's status: Blue cloud: OneDrive is signed in and syncing. Gray cloud with a line: OneDrive is not signed in.
3. If not signed in: Click the gray OneDrive icon. Follow the prompts to sign in with your Microsoft account.
4. Verify sync status: If signed in, right-click the OneDrive icon and select "View sync issues" to check for any errors.
5. Check your files: Ensure your files are syncing and that you see the expected green check marks or other sync status indicators on your files and folders.