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 @2ffa8eb4 sorry -- a better description is in the issue, i.e. https://github.com/fwupd/fwupd/issues/6153 
 @ab1bf6c3 that bug report is a bit vague. The error messages are nothing i can really grok.

My educated guess is that this is about dbus-daemon vs. dbus-broker. Fedora uses the latter, conservative distros otoh still havent made the switch. The two daemons handle user name resolution in the policy differently, and this causes quite weird behaviour and in particular different behaviour between the two broker implementations. Dynamic users by their nature are transient and hence only... 
 @ab1bf6c3 ... resolvable as long as the relevant service is up. The policy logic in the brokers arent ready for that, they assume everything is always resolvable.

There has been discussions on addressing this, but neither implementation is really making big jumps ahead, dbus land is kinda stuck it appears. 

Tldr: dynamicuser atm is kinda incompatible with dbus.