There click on the Plus(+) button and add the following DNS Server to the Mac.Try changing the Google DNS of your Mac, and then check for the updates. It might be possible your Mac is not updating the Office Apps and throwing server errors due to DNS not working. Put your Mac in Safe mode and check for update.Uninstall App and Reinstall latest Office 365 on your Mac.Change WiFi network, Becuase Public and Private WiFi network blocked all update incomming connection port.Sometimes, your office does not authenticate with purchase products in your account. Force close Office on Mac and Re-Open.From top Menu > Word/Excle/Powerpoint > Sign Out & Sign in. Your Office signed in with your Activation details.Alternatively, if you don’t find that file, re-download the Microsoft AutoUpdate file from the above link.

If this file exists, then run the Microsoft AutoUpdate file that you’ve downloaded. And navigate to PrivillegedHelperTools.From there, Top menu Bar, Go > Go to Folder.Download the Microsoft AutoUpdate on your Mac.However, if you believe in keeping the Office Apps up to date, and this AutoUpdate Tool isn’t working for you, here’s how to fix AutoUpdate Mac won’t update. AutoUpdate Tool automatically updates the Office Apps installed on your Mac. Make sure Automatic Updates is selected.Click on App Store in the top menu bar.Select the Updates option in the sidebar.

Make sure your Mac is not dealing with this same issue. Few users have raised a concern about App Store not updating the apps automatically even though Automatic Updates is turned on.

Have you download the Office Apps from App Store? Then use the Mac App Store to download the updates.

To Update All the apps, click Update All or click Update next to each app.

Under the Advanced Option, Select “Current Channel” and Enable checkbox “Automatically download and install”.

There you will see the number of Updates Available, and to see all the Microsoft Office Pending Updates, click on the dropdown next to the Update All button.

Choose Automatically keep Microsoft Apps up to date to automatically update Microsoft Office Security Fixes and other improvements.

Launch any of the Microsoft Office Apps like Word in your Mac.

Repair office on mac