@Lucy171 make sure tge new Sky hub is in tge best position possible which is on a surface out in the open so its wifi signals is not being blocked unnecessarily. The issue with many blocks is the internal walls are often solid which does make wifi networking difficult so you msy need a booster which Sky will supply as part of their WiFi Max package see https://www.sky.com/help/articles/sky-wifi-max
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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
