Office Cannot Sign Into Microsoft Error: Step-by-Step Fixes

If your workflow is blocked, confirm the account and app context, then follow the ordered fixes below.

Problem Description: Cannot Sign Into Microsoft

Whenever I try and login to any of my MacOS Microsoft applications, I cannot as it tells me: "Another account from your organisation is already signed in on this device. Try again with a different account." I have tried everything, including removing all accounts related to Microsoft from 'internet accounts' in system settings. I don't know what else there is to do. I use Microsoft for education. The error comes up as: Correlation Id: [Moderator note: personal info removed]  Timestamp: [Moderator note: personal info removed]  DPTI: [Moderator note: personal info removed]  Message: AAD multiple accounts from same realm is not supported by clients. Tag: 5pzx9 Code:

Quick Answer for Office Won't Complete Task

Sign out of all Microsoft 365 apps first.

Likely Causes Behind Common Sign-in Triggers

• The Microsoft account or license context may not match the purchase or device.

• Cached credentials, outdated builds, or damaged local components can trigger sign-in & login problems.

• A file-specific corruption or add-in conflict can mimic a broader application failure.

Recommended Solution: Transferring Office License Safely

When to use this: Apply these steps when the symptoms match and you can access the relevant Microsoft account or administrator.

1. Remove Microsoft credentials from Keychain by starting the Keychain Access app, searching for and deleting any entries related to Microsoft accounts.

2. After removing credentials, try signing in again to the Microsoft apps.

3. If the issue persists, ensure all steps are completed and consider checking for any additional Microsoft-related entries in Keychain that may need removal.

Alternative Solutions for Broader Sign-in Workarounds

1. Retry the Microsoft-side steps after restarting the app and device.

2. Test the same action in a private browser session or a new blank file to isolate account vs file issues.

3. Capture exact error text and screenshots before contacting Microsoft Support or your administrator.

Working with WPS Office: Using WPS While Office Is Unavailable

WPS Office cannot replace Microsoft account, activation, or cloud fixes for this scenario. It remains one of the best free Microsoft Office-compatible alternatives for opening and editing local files.

1. Download and install WPS Office from the official website.

2. Open local Word, Excel, PowerPoint, or PDF files in the matching WPS app.

3. Save a working copy locally while Microsoft-side issues are resolved.

4. Return to Microsoft Office after the primary fix succeeds.

If you need a practical local workspace in the meantime, try WPS Office.

Prevention Tips for Avoiding Repeat Sign-in

• Keep one primary Microsoft account for subscriptions and Office sign-in.

• Install updates for Office and Windows before retrying failed workflows.

• Back up important files before repair, reset, or reinstall actions.

• Register more than one MFA method and keep recovery contacts current.

FAQs About Cannot Troubleshooting FAQ

Can WPS Office fix this sign-in & login problems issue directly? Only when the WPS steps match the formatting or file task. Account, activation, and cloud issues stay on the Microsoft side.

Should I reinstall Office before trying these steps? Not first. Confirm account, license, and the exact error before reinstalling.

What should I send to Microsoft Support? The affected account email, device type, Office version, exact error text, and screenshots with personal data hidden.