ms365 16.89.1 (24092212) not working on macos 26.3

Question

I haven't been able to install ms365 16.89.1 (24092212) on macos Tahoe 26.3, despite them apparently being compatible. Can anyone help?

Thanks.

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Mod moved from : Microsoft 365 and Office | Other

Answer 1

It seems that you are experiencing issues with installing Microsoft 365 version 16.89.1 on macOS Tahoe 26.3. While compatibility issues can arise, here are some troubleshooting steps you can try:

1. Check for Updates: Ensure that your macOS is fully updated. Sometimes, newer versions of applications require the latest OS updates.
2. Uninstall Previous Versions: If you have any previous versions of Microsoft 365 installed, consider uninstalling them completely before attempting to install the new version. You can follow the instructions for uninstalling Office for Mac.
3. Reinstall Microsoft 365: After uninstalling, try to reinstall Microsoft 365 from your Microsoft account.
4. Check System Requirements: Verify that your Mac meets the system requirements for Microsoft 365 version 16.89.1.
5. Contact Support: If the problem persists, consider reaching out to Microsoft Support for further assistance.

These steps should help you troubleshoot the installation issue you are facing.

Answer 2

Hi Janet,

Good day. I'm Jhun an independent advisor. MacOS Tahoe version 26 is supported right now for Microsoft 365 installations and updates. Since yours is 26.3, you should be able to properly install it and run Office. Let's try to do these fixes below.

A. Use the official installer.

1. Remove any current Office installs completely: Quit all Office apps. Delete them from /Applications. Optionally remove related support folders in ~/Library (like com.microsoft.*). This helps clear out corrupted leftovers.
2. Download the latest Office installer from: https://www.office.com > Sign in > Install Office. This ensures you’re getting the correct build for your subscription.
3. Use a different browser if needed, Safari tends to cache old installer files, try chrome.

B. Sometimes macOS blocks apps from unidentified sources. Clear installer issues.

1. Go to System Settings > Privacy & Security > scroll to Security.
2. If you see Microsoft Office blocked, click Allow/“Open Anyway”.

C. Try to install Microsoft 365 while your Mac is in Safe Mode.

D. Check for Updates.

E. If Word/Excel/PPT installs but wont launch and immediately quit, try toggling Rosetta. Right-click app > Get Info > enable “Open using Rosetta”. This sometimes helps if the installer isn’t recognized as native.

F. Last Resort. Try to create a new macOS user account and install Office from that new account. If this works, the problem is with your main user's settings.

Lastly, can you list your Macs complete hardware specifications?

Regards,
Jhun