Likely the reason this doesn't work, is because nss-mdns does not
resolve reverse DNS for IP addresses other than the link local range
(169.254.0.0/16).  This is by design and per-spec.

So this will never work, you'll need to look at either:
(1) using the IP address range (according to the sshd_config man page you can 
use a CIDR range), or
(2) setting up a local real DNS zone synchronised with your DHCP server so that 
it sets up something like hostname.lan with matching reverse DNS.

** Changed in: openssh (Ubuntu)
       Status: New => Invalid

** Changed in: avahi (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1698317

Title:
  AllowUsers *@*.local in /etc/ssh/sshd_config does not work

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