@Ramaa You can't mesh your deco to your ISP router but you can use your deco in AP mode to extend the WiFi your ISP router is providing. See the steps in this post...

@Sparkley While you wait for David could you please submit your Deco App logs by using the following instructions :How to submit Deco APP log Thank You

@speed01 Sorry about that. Every Kasa switch has worked liked that, Not sure how they set up the Tapo switchs lets ask Wayne who works for tp-link. @Wayne-TP

@speed01 This screenshot was taken from a Kasa Matter Smart Dimmer Switch model KS225. It's also a Matter certified switch as well. I'm sure other Kasa and Tapo switches have this option.

@David-TP

@David-TP First time I'm hearing about tp-link Aginet this is all you.