@Brad999999 Set updated AX6000's DHCP to OFF and test again. If your other AX6000 is in AP mode too, set its DHCP server to OFF too. The connection between HB810 and AX6000s should be HB810 LAN port...

@Drizit Your observation is correct - here are more details about the purpose of TP-Link's IoT.

@Brad999999 Put some screenshots of your AX6000 LAN and DHCP settings as well as its Network Map:

@Shoulders Here's the list of routers that support the Easymesh with an ethernet backhaul. BE450 doesn't' seem to be in this list, but the list is dynamically updated, so keep an eye on it.

@Ziko44 The number of devices that can connect to a TP-Link RE depends on the specific model. Single-band extenders, like the TL-WA850RE, typically support around 8 devices. Dual-band extenders, such...

@PorterLink Yes, you can: If you don't need the ISP router Wi-Fi you can just disable its wireless radio. Thus you can use only the TP-Link router wireless radio at your premises. Best practice in...