You set VPN server or client on your own VPN router? Now, you connect Deco M5 into this VPN router but it won't transfer any vpn statisitcs? Generally speaking, Deco M5 also supports VPN passthrough...
Forums/ Access Points
The Wi-Fi range is usually affected by the real environment, such as barriers, distance and so on. How big is your house? is it mulit floors or one level? You need to add the extender devices...
Forums/ Range Extenders
It seems you have already finished the setting, and now you just try to connect the Wi-Fi,right? The password should be the same as you main router. try to remove/forget the profile and reconnect to...
Forums/ Kasa Smart Bulbs
try to remove TP-Link utility and reinstall it..good luck.
Forums/ 3G/4G Routers/MiFi
If it's not on that list, it means it hasn't been test by tp-link. Therefore, they can't make sure they will work properly together. It's better to get one which is compatible with the router.