@angelickevin Hi, Yes, that would work. As the main Deco wiredly connects to modem.

@Zoogs Hi, Please connect your phone to the Deco WIFI and test again and also pay attention to the format of the MAC address.

@aaaaaaa111 Hi, How much speed can you get when you connect via Ethernet cable from the main Deco? Usually the wireless speed will be slower then the wired speed, as the wireless signal will be...

@DW103 Hi, Please double check the model number of your Deco, AX3000 seems to be the specification of the Deco. How to find the model number of your TP-Link device. After you finish the set up...

@rajchand Hi Raj, Please check if you have set up parental control for these two devices, which may cause this issue. How to setup Parental Control on the Deco. Can the phone and TV use Amazon Prime...

@Brongo Hi, Please test the SIM card and check if it can get a stable signal. And you can refer to this troubleshooting steps: What should I do if my Deco 4G/5G Product shows No Signal or No Service...