@Brownie571 you can only split WiFi bands on the older bllack Sky hubs see https://helpforum.sky.com/t5/Broadband-Talk/How-to-separate-WiFi-bands/ba-p/3530610
As you will see when you read that post you cannot split the bands on the newer white hubs so the workround is to temporarily disable the 5GHz band connect your problem devices and renable the 5GHz band.
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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
