Backgound - I’m running on an update-within-a-month Linux Mint system against a mounted SMB NAS share.
Issue - my maintenance run is complaining about too many index blobs AND that it must be run by a designated user (even though I’ve set the owner as copied out of maintenance inforesults). Each time I run it, the number of blobs reported increases by 1 (first 1501, then 1502…1503…1504). 
What is maintenance doing that creates a blob (I thought it was supposed to help REDUCE blobs) and how do I reverse this trend?
me:/$ kopia maintenance set --owner=me@myPC-3me2km8b
Found too many index blobs (1503), this may result in degraded performance.
Please ensure periodic repository maintenance is enabled or run 'kopia maintenance'.
Setting maintenance owner to me@myPC-3me2km8b
me:/$ kopia maintenance run
Found too many index blobs (1504), this may result in degraded performance.
Please ensure periodic repository maintenance is enabled or run 'kopia maintenance'.
maintenance must be run by designated user: me@myPC-3me2km8b
me:/$