It can be the same problem I had where mDNS was not working correctly. Solution to this was given in thread Using homekit component inside Docker
Or short what I did om my Mac mini was this command.
dns-sd -R Homeassistant _hap._tcp local 51827 md=”HA Bridge” pv=1.0 c#=2 id=00:11:22:33:44:55 s#=1 sf=1 ci=2 ff=0 sh=UaTxqQ==
where the MAC-adress should be the same as in .homekit.state