When Office stops working as expected, start with the shortest official checks before you reinstall anything.
Problem Description: Am Working Spreadsheet Imac
As well as a new laptop, I have an older iMac and which works fine. After renewing my sub I seemed to be signed out of MS Office on the iMac. I am using Excel and it won't allow me to save because of this issue. How can I sign back in without affecting my work? Can't seem to add it to my devices on my account either.
Quick Answer for Office Setup on New Device
To resolve the signing issue on your iMac, launch Excel and access the profile menu at the top of the window to sign out of your current session.
Likely Causes Behind Sign-in Root Factors
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Cached credentials, outdated builds, or damaged local components can trigger sign-in & login problems.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: Fixing Sign-in Step by Step
When to use this: Apply these steps when the symptoms match and you can access the relevant Microsoft account or administrator.
Once signed out, select the sign-in option and carefully enter your valid Microsoft 365 credentials, making sure to choose the correct Work or School account type.
Before proceeding, verify that your subscription remains active and that all necessary licenses are correctly assigned, which may require checking the Microsoft 365 Admin Center if you have administrative privileges.
After successfully authenticating, completely quit the Excel application and relaunch it to ensure the new session initializes properly.
If you continue experiencing save errors or authentication failures, review your account permissions for any restrictions or proceed to uninstall and reinstall the Office suite to restore default configurations and clear corrupted cache files.
Alternative Solutions for Secondary Login Fixes
Retry the Microsoft-side steps after restarting the app and device.
Test the same action in a private browser session or a new blank file to isolate account vs file issues.
Capture exact error text and screenshots before contacting Microsoft Support or your administrator.
Working with WPS Office: WPS as a Local Alternative

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.
Download and install WPS Office from the official website.
Open local Word, Excel, PowerPoint, or PDF files in the matching WPS app.
Save a working copy locally while Microsoft-side issues are resolved.
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 Keeping Office Stable Long Term
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 Office Support Questions
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.




