I'll answer my own question: in WFA 2.2 (and later I presume) each Dictionary in the Designer tab has a "Acquistion Enabled" attribute. Just view the Dictionarys, find the 'User_Quota' dictionary which will show as Acquistion Enabled: false ... right-click and pick Enable Acquistion. I'm not sure if it was required, but I did a
[ Reset Scheme ] on existing data sources and then 'Acquire Now' and then had a valid storage.user_quota.
NOTE: the above is talking about 7-Mode. The cm_storage.Quota_Policy and Quota_Rule say "Not Applicable" under "Acquistion Enabled" (WFA 2.2 and 3.0RC1) which I interpret to mean not supported, or not polled through/via OCUM