setting cephfs quota with setfattr, getting permission denied

["Zach Heise (SSCC)" <heise@xxxxxxxxxxxx>]

We're preparing to make our first cephfs volume visible to our users for 
testing, as a scratch dir. We'd like to set a quota on the /temp30days 
folder, so I modified my MDS caps to be 'rwp' as described here 
<https://docs.ceph.com/en/latest/cephfs/client-auth/#layout-and-quota-restriction-the-p-flag>, 
umounted and remounted cephfs from the client with rwp access, and yet 
the command setfattr -n ceph.quota.max_bytes -v 1000000000000 
/mnt/myrandommountpoint/temp30days still results in "permission denied"

Did I miss a setup step?

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