@Ee11 assuming you have not changed the default settings on the Sky hub your connection is reasonably secure so you can ignore the message. It could be from the OS like Windows because you have not tokd it that Sky wifi is a home network or from the wifi card moaning thst the wifi security is not using WPA3 the latest standard. The older black Sky hubs only support WPA2 and while the newer white hubs support WPA3 setting them to use that disconnects most of your other devices.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
