I'd like to create use and grant them access to do snapshot mangement on one particular volume and only that volume.
how would I do that in CDOT 8.2.3
See The Solution
Refer https://library.netapp.com/ecmdocs/ECMP1196798/html/GUID-979F5A04-CE0D-4136-91A7-5E0FB4AEBA4D.html to allow snapshot access. Refer https://library.netapp.com/ecmdocs/ECMP1196991/html/GUID-56684CAA-FA05-450C-93D4-C12D8A695F07.html to restrict access.
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I think the key here is I want to grant one particular user access to only one volume.
the links you provided grant a single user access to ALL volumes... not really what I need.
You can use -query "-volume <vol_name>" to define the volume to which access is needed.
Refer https://library.netapp.com/ecmdocs/ECMP1196817/html/security/login/role/create.html where access is restricted within aggr0