Office 365 Account No Longer Exists Error: Step-by-Step Fixes

When Office stops working as expected, start with the shortest official checks before you reinstall anything.

Problem Description: Account No Longer Exists

Hello, I have used Microsoft Office for almost a decade, and just today both myself and my business partner can no longer access our account. It seems there are actually two accounts linked to my email. One is a Skype related account with no Office 365, and the other is a business account. I cannot access the business account. We get the following error messages: 1. This username may be incorrect. Make sure you typed it correctly. Otherwise, contact your admin. 1. "Selected user account does not exist in tenant 'Microsoft Services' and cannot access the application '[Moderator note: personal info removed]' in that tenant. The account needs to be added as an external user in the tenant first. Please use a different account." 1. Sorry, but we’re having trouble signing you in. AADSTS900561: The endpoint only accepts POST requests. Received a GET request. Troubleshooting details If you contact your administrator, send this info to them. Copy info to clipboard Request Id: [Moderator note: personal info removed] Correlation Id: [Moderator note: personal info removed] Timestamp: [Moderator note: personal info removed] Message: AADSTS900561: The endpoint only accepts POST requests. Received a GET request. Flag sign-in errors for review: [Enable flagging](https://login.microsoft.com/common/debugmode) If you plan on getting help for this problem, enable flagging and try to reproduce the error within 20 minutes. Flagged events make diagnostics available and are raised to admin attention."

Quick Answer for Office Won't Complete Task

If your Microsoft account no longer exists and support has been unresponsive, escalate the issue by contacting Microsoft Support through alternative channels such as the Microsoft 365 admin center or the dedicated support phone line.

Likely Causes Behind Common Microsoft Account Errors Triggers

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

• Cached credentials, outdated builds, or damaged local components can trigger microsoft account errors.

• 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. Reference your original ticket number and request escalation to the data protection team.

2. If necessary, file a formal complaint through Microsoft's customer feedback portal to expedite resolution.

Alternative Solutions for Broader Microsoft Account Errors 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 Microsoft Account Errors

• 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 Account Troubleshooting FAQ

Can WPS Office fix this microsoft account errors 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.