Issues with MSFT Office 365 updating?

I have MS Office 365 running on 3 different systems, 2 MacBooks (apple silicon) and a 2017 iMac (intel silicon, OCLP).

For some reason the iMac continually fails to run MSFT Auto Udater and every time there is an update I need to download the whole damn 2.5GB suite in order to do the update.

Is anyone else seeing this?