@peter_H.-123 Check this thread for details on that matter.

@George66 Check this FAQ - Part 3 - Q3.3 and Q3.5. When you change the router's wireless settings you should re-configure the extender as well to update the host network password.

@Jeremy98 Try with a different ethernet cable to exclude cabling problems - use CAT5E/6 cable (it's recommended to use the cable included in the AX3000 box). If that doesn't help either, you could...

@42gv Yes, that's possible with ER505X : Topology: router )) (( RE1 <Ethernet> RE2 (AP mode) This requires that the RE2 supports AP mode. For more details follow this FAQ - Part 3 - Q3.6

@chesterflaps It maybe the case that the 2.4GHz wireless signal from your sky router is stronger than the RE200 extended wireless signal and the smart devices are connecting to the sky router rather...

@chesterflaps You can check that via web browser for sure if you log in http://tplinkrepeater.net or http://192.168.0.254 (or whatever IP address you've set on RE200). That would lead you to the...