Microsoft began offering curated deferral channels for AutoUpdate a little over two years ago. These feeds allowed MacAdmins to delay updates to Office apps for a set number of days, without having to run a custom manifest server themselves.
Unfortunately these deferral channels have recently stopped working, leaving many MacAdmins scrambling to adjust.
Thankfully the community has engaged Microsoft and have pushed for a solution.
Read on for the details on why this happened and how to adjust your configuration.