I cannot login my school account to my computer to stop syncing my account with my desktop

Error Code 1200 is a sign-in authentication error, and it's typically caused by:

• A problem with your Azure AD / Microsoft 365 school account
• A misconfigured browser session or cookie
• A corrupted Windows account token (especially if you're trying to log in to OneDrive sync on your computer)
• School policy restrictions (e.g., login blocked by your admin)

From the screenshot:

• Correlation ID and Error Code 2148073494 suggest a token or certificate issue, often on the Azure AD / school configuration side.
• Your school IT admin can:

Review the error via the Azure AD logs

Confirm your device isn’t blocked or disabled

Re-enable login for your user

Reissue a clean login token

You can forward them this info + screenshot and say:

    “I'm receiving error code 1200 and error 2148073494 when trying to sign into OneDrive or disconnect my school account from my Windows device. Can you please check if there’s a conditional access policy or expired token causing this?"

Beforehand, you could try this:

Clear Cached Credentials in Windows

If you're trying to sign out or stop syncing OneDrive with your school account:

• Go to Windows Settings > Accounts > Access work or school
• Select your school account
• Click Disconnect
• Restart your PC
• Try signing into OneDrive again

If you can’t disconnect:

• Try it via Work or School Account settings in the Control Panel (search: Credential Manager > look under "Windows Credentials")

Or/and…

Clear Browser and Microsoft Edge Cache (if using browser sign-in)

• Sign out of all Microsoft accounts in your browser
• Clear cookies & cache
• Ctrl + Shift + Del → Clear all time → Cookies + Cache
• Restart your browser (or try Incognito/Private Window)
• Visit: https://onedrive.live.com and log in again

Hope this helps you