are you having trouble from onsite or offsite?
to work onsite, your apple mobile device must be on the same network/vlan as the loxone minserver - does the loxone mobile app work when on your wifi network?
to work offsite, you need a homekit bridge, which can be an apple tv or ipad , and it must be logged into the same appleID as the apple device you are using offsite
what exactly isnt working? can the loxone app find the miniserver when doing the homekit setup?
does the homekit setup in the loxone app work at all?
does it find the appropriate devices?
are you using a suitable loxone user name that has rights to the devices you want to use in homekit?