@HelpmeJ First confirm which region your AX20 HW v2 is. On the bottom sticker you should be able to see its FW region. If it's with US FW region then you're at the right place. Here's (Case 1) a...

@DMCMedia You can't - OneMesh FAQ - Q10/A10. You have to use a RE or a PLC in conjunction with the router - Q9/A9.

@bnetanel 1) 2) I don't believe there's a setting for IPv4/IPv6 priority in the WegGUI. If you're not comfortable to have them both at the same time just disable IPv6.

@lidans Refer this guide - Case 1. Ethernet connection between routers shoud be like main router LAN port => AX10 WAN port.

I believe that @user30 refers to this step from the FAQ in question: The list with "delete" option will show only the online devices if I am not mistaken. While this could be considered a WebGUI...

@Brewer 801ND is with an EoL status (end of life) according some regional TP-Link websites and its latest FW release is from 2017. TBH, I am a bit skeptical about finding a resolution if this turns...