@Vikranth ignore the error message it is essentially rubbish as Sky hubs like virtually all routers do not limit connection by registration of mac addresses.
There are several possible causes. Firmware upgrades can cause issues so check the TV's network settings in particukar turn off any network energy saving options. If you have a white Sky hub check the wifi security setting is on WPA2 you will find thst in the advanced section of the hub's settings in the My Sky app. Hopefully thst will sort the issue.
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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
