@Bee06 it is likely to be one of your own devices as the string the device reports to the hub is often not the name you recognise rather who made the wifi card or similar or simple show as "unknown". Individual devices cannot be removed or blocked you can only change the WiFi password
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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
