@Shug2 using a phone che k there is sufficent wifi signal in the garden room as wifi outsidecthe main house is always iffy. If there isnt then consider either geeting an ethernet cable laid from the hub or using a Powerline Networking kit which usesctge mains wiring to carry the signal.
If there is sufficent signal and if you have tge white Sky hub try reducing the WiFi Security setting in the My Sky app from WPA3=T to WPA2 as some TVs have issues with thenewer standard.
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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
