@Michelle842 if your new Sky hub's is white then there are changes to how your Sky Q boxes work. Firstly Sky Q ninis have to be connected to the main Q box not directly tonthe hub. If you have issues call Sky as you may need a Sky Q booster.
The reason why some of your other devices are not working as they did before is probably because they were previously connecting the wifi hotspotsxyour Sky Q boxes provided. These hotspots no longer can be used with the new hub so you may need a matched WiFi extender pod which Sky should supply if you pay for their WiFi Max package.
In general the new hubs are poor matches for customers still on Sky Q which uses an old incompatable WiFi system which unfortunstely Sky does not explain fully. The older black hubs msybe in tgeory slower but in practice work far better with Sky Q.
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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
