I am unable to link my 2.4Ghz smart devices to my Sky Max router. Can anyone suggest a solution?

[Guy13]

Hello, I recently received a new Sky Max router. The Sky engineer linked my smart phone and Chromebook to the wi-fi but since then I have not been able to link my smart lights or Octopus home mini. The devices are searching for the WiFi, without success. A Sky engineer I called suggested I turn off the 5Ghz using my Sky app and reduce the security setting but without success. My daughter used Bluetooth to link the smart lights. I am not sure how to link the home mini or any future 2.4Ghz device I may purchase in the future. Am I missing something obvious? 

[TimmyBGood]

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@Guy13 wrote:

A Sky engineer I called suggested I turn off the 5Ghz using my Sky app and reduce the security setting but without success. 

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You couldn't do those things, or you did but doing so didn't improve the situation?

[Guy13]

Hi, I followed the instructions but they didn't help.