@David-TP 

Thanks very much for your prompt response.

Unfortunately suggestions you have linked do not work for me.

Network Device Disabling 6GHz Frequency due to AP's Country Code

Not sure I can do anything with this. I'm in the UK (and have checked all possible Windows 10 region & language settings) and purchased Decos from Amazon UK so hopefully their country code is set up for UK to allow to broadcast on 6 GHz. The Wifi card in the laptop is actually retrofitted one also purchased from Amazon UK (the original card was only 802.11bgn).

Older driver - 22.45. X for Intel AX210

I have downgraded the driver to the one suggested (have 22.45.1.1 now) but I still cannot see my 6GHz network. I have tried to hide 6GHz SSID in Deco app, reboot Decos then unhide it and reboot again but to no avail - still can't see 6 GHz. I have checked all relevant advanced settings of this network adapter and even set the preference to 6 GHz band but still nothing.

Any other suggestrions?

As per your statement, you are unable to see the SSID of your 6GHz network and hence cannot connect to it. This can happen due to various reasons such as:

1. The 6GHz network may not be enabled on your device or router.
2. Your device may not support 6GHz network connectivity.
3. The 6GHz network may not be broadcasting its SSID, which means it is hidden.

To troubleshoot the issue, you can try the following steps:

1. Check if your device supports 6GHz network connectivity. If it doesn't, you won't be able to connect to the network.
2. Check if the 6GHz network is enabled on your router or access point.
3. If the 6GHz network is hidden, try entering the SSID manually on your device.
4. Restart your device and the router/access point.
5. If none of the above steps work, try resetting your router/access point to its default settings.

I hope this helps you in resolving the issue.

  @David-TP 

Many thanks,  support email received.

In the meantime I have tried to enable Guest Network to see if 6G potentially works. So activated Guest Network, still can't see 6GHz, only 2.4 & 5GHz seen. Rebooted both Decos but still nothing so switched the Guest Network off.

Tried to switch the 6G band off in Advanced settings of my AX210 Wifi card and turn it on again - no avail

Therefore looking forward for further investigation.

  @David-TP and others

Just to let you know I have manually installed Windows 11 (i.e. did full clean install despite CPU being incompatible) and finally laptop has been able to discover and connect to 6GHz network