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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Hi There,

I have the same problem that remote Access is not working reliable.

My Setup:
I have a Nuki Smart Lock Pro (4th gen) including a Keypad and a Door sensor. After the Setup of the Lock, I have setup a Matter Network via Homeassistant on a Intel NUC and Connect ZBT-1 Stick.

According to this page, my setup should support remote access: https://help.nuki.io/hc/en-001/articles/14596875392017-Setting-up-your-Matter-integration

For the Matter Setup on Home Assistant, I followed these Steps: Thread - Home Assistant

For enabling Matter on the Lock, I followed these steps: https://help.nuki.io/hc/en-001/articles/14596875392017-Setting-up-your-Matter-integration#:~:text=Steps%20to%20activate%20Matter,“%20and%20select%20“Matter“.

Everything Worked so far. When I opened the nuki app a little while later, The Matter Settings tell me, that Remote Access is enabled, but not working Correctly:

My Assumption is, that maybe NAT64 is not enabled on my Open Thread Border Router. I have not specifically enabled it during the setup, as I have not seen this option anywhere.

Does anyone know, where I can enable this Option in Home Assistant? I have not found any hints in google about it…

This is in Settings, Add-ons, OpenThread Border Router, configuration. Enable “show unused optional configuration options” then you find NAT64 to activate. Save and restart OTBR.

Thanks, in the meantime I also finally found it and enabled it. After uninstalling everything again and starting fresh, it now also works…