@Eva333 connecting doorbells can be difficult as they are usually attached to a double skinned brick wall which is just about the worst place for WiFi signals. If it is an older model doorbell you may have to connect it to the 2.4GHz band but recent models will connect to dualband WiFi. What colour hub have Sky provided?
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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
