See screenshots below. Truenas 25.10.2.1 - Goldeye.
seems there was a change to portainer and it now wants to run as user 568, instead root (uid 0). At least that’s my guess from what i can decipher from the error picture.
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Assuming that you’re right, I am guessing that I should change these both (see screenshot below) to 568, right? 
yes that should do it, at least that’s what i think.
Yeah, I tried that and the container wouldn’t start, so I had to revert to 0. Maybe if I delete the container, and build it anew w/568, maybe that’ll work.
It may be a permission issue, if user 568 doesn’t have permissions for the iXVolume or the hostpath you’re using it may refuse to start
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Here’s what I found on the matter. The big question is, how do I “change the data directory ownership to a non-root user“? And what user should that be?
When you edit the app, for the storage section there should be a checkbox to enable ACL support. If you check it and add user 568 to the acl list it should do it (but since i don’t use portainer myself i can only guess)
Thanks. I had to first switch from an ixVolume to a regular dataset, and then i had to re-build my whole Portainer from pretty much scratch. Anyway, your suggestion about switching from UID 0 to 568 is precisely what had to happen, as per this. Cheers!