@Leannejane several possible reasons but if other devices connect in the room the TV is in and you have a white Sky hub go into the hub's advanced settings in the My Sky app and changectge WiFi security level from WPA3-T to WPA2 as some TVs cannot connect to the higher security setting.
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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
