KEA-Problem with Reservation: ALLOC_ENGINE_V4_DISCOVER_ADDRESS_CONFLICT

[The_Istar]

Hi All,

I migrated to KEA yesterday hoping to try it out and for the most part things seem to work.
However I am running into a weird issue with one of my devices for which I created a reservation.

I created the reservation without errors and initially the device even takes the address I assigned. However after a few minutes I see the following in the logs:

2024-02-12T10:38:18   Informational   kea-dhcp4    INFO  [kea-dhcp4.leases.0x834ee2f00] DHCP4_LEASE_ADVERT [hwtype=1 xx:xx:xx:xx:a9:93], cid=[01:00:00:00:00:00:00], tid=0x2bf8807b: lease 10.0.0.103 will be advertised
None   None      Remote ID:     (none)
None   None      Relay ID:      (none)
None   None      State:         default
None   None      Pool ID:       0
None   None      Subnet ID:     3
None   None      Client id:     01:xx:xx:xx:xx:a9:93
None   None      Hardware addr: xx:xx:xx:xx:a9:93
None   None      Cltt:          1707730161
None   None      Valid life:    3600
2024-02-12T10:38:18   Warning   kea-dhcp4    WARN  [kea-dhcp4.alloc-engine.0x834ee2f00] ALLOC_ENGINE_V4_DISCOVER_ADDRESS_CONFLICT [hwtype=1 xx:xx:xx:xx:a9:93], cid=[01:00:00:00:00:00:00], tid=0x2bf8807b: conflicting reservation for address 10.0.0.26 with existing lease Address:       10.0.0.26

After which the device promptly changes IP to 10.0.0.103.
This comes back in the log every 5 minutes and every time it getś a new IP. But it never stays on the IP I reserved for it (this would be 10.0.0.26 as shown in the error).

I have several other reservations setup in the same range and these all work fine.

I tried recreating the reservation several times already. Rebooted the OPNsense box. Rebooted the device several times. But I keep getting this error and the device moving IP every 5 minutes.

Any idea what is going on here? Any help is appreciated.

[The_Istar]

Ok, it seems I was mistaken in that the device got the other IP.
It seems that the device is indeed keeping the correct IP from the reservation.
What confused my was the Unifi dashboard that does show the device as having the wrong IP.

That still makes things confusing as KEA seems to be complaining that the can not assign the reserved address to the client because it is already assigned to that same client?

[The_Istar]

I tried to assigning a different IP to the reservation but the problem just moves with the new IP.
The device does seem to get the new IP fine though.
I really do not understand what is going wrong here.