@Andrewmacif other devices are connecting normally check the set up on the PS5.
However to play games online you need a stable internet connection which in many homes WiFi is not a suitable method to use. Ethernet is always the best but where thst is not practical use of powerline networking is a goid alternative especially if the console is on a different floor from the hub. Powerline adapters use your home's mains wiring to carry the data.
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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
