There doesn’t seem to be any resolution for that situation. In my case, my Office 365 subscription is paid through Apple’s App Store (I like the irony), although its updates are still delivered through MAU rather than using the regular App Store app, which has always struck me as being odd. Thanks to bucky for suggesting that those with a volume licence can simply uninstall MAU and run MacUpdater or use other solutions to obtain updates. However, neither re-installing version 4.22 nor installing the previous version have altered its behaviour here. You can download a fresh installer for MAU from this page. If you have any of the Office 365 apps installed, you may find it trying to run repeatedly at frequent intervals, when it reports no updates are available, or it may simply get stuck running in the background.
There are widespread reports that Microsoft AutoUpdate (MAU) version 4.22, which was released on 14 April 2020, doesn’t run correctly.
