Nuki Remote Access Not Working

Has anyone managed to get the remote access working via HA border router?
I had a Nuki 4 (non pro) delivered yesterday and have connected it to HA via a brand new SkyConnect (SkyConnect set to Thread rather than Zigbee). I know I can view status remotely via HA but also really want the Nuki app to work remotely (ama aware I will need to pay the fee which I’m happy to do).
When setting up the SkyConnect (before unpackaging Nuki) I ensured I had set the NAT64 to enabled (OTBR firewall also enabled and bud rate set to 460800).
I have the Nuki connected by Matter but not remote access:


If I pull the batteries out of Nuki for 10 seconds and then reinsert, the Nuki app shows enable but within a couple of minutes the option disappears and shows the above pic.
I do have a Google Nest Hub Max on the same wifi network however in the Matter Server addon in HA, under Nodes, I can see the lock - my assumption is the lock is paired to Thread via HA and not via Google (HA Thread network is set to preferred network and I exchanged credentials on iPhone before setting up Nuki).
In OTBR logs in HA I do see a lot of Default: mDNSPlatformSendUDP got error 99 constantly repeated - I wonder if this is the problem?

Nuki firmware: 4.3.11
HAOS: 2024.9.2 (running on Proxmox)
HA Supervisor: 2024.09.1
OTBR addon: 2.10.0
Matter addon: 6.5.1
iPhone 12 Pro Max
iOS 18
Unifi OS: 4.0.6
Unifi Network: 8.4.62 (mDNS is enabled on the network)

Managed to resolve the issue - I removed all integrations, read the following (as I already had Matter setup via Nest Home Hub Max) implemented it the way the instructions said and everything now works:

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