iptables owner match not working in 8.10

[Dirkomatic]

I receive:

iptables: No chain/target/match by that name

whenever I try to use

iptables -A OUTPUT -p tcp --dport 8081 -m owner --uid-owner proxy -j ACCEPT

or any other valid iptables statement using an owner / --uid-owner match.

This is very frustrating... I see a few other posts from people with the same issue, but no real resolution. Is this an issue with the kernel or with iptables? How can I resolve it?

Thanks.

[Dirkomatic]

This may or may not help, but I recently upgraded from 7.04 to 7.10 to 8.04 to 8.10.