Auto-Update has been designed to functionally mirror the Mac App Store process, and as such deferrals are not available.
However, as updates for Auto-Update are not forced, the user may ignore any prompt notifications until they are ready to perform the updates.
If you would like to see which users have updates pending, then please track via the Auto-Update Extension Attribute and contact these users as per your organisation's policies.
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Alternatively, please see our frequently updated knowledge base articles for reference.