@SteveOllie Check this answer. If you want a WDS compatible device you can go for Archer C6/A6 or Archer C7/A7. From AX series I believe AX73 and AX6000 support WDS as well.

@LCG What's the make and model of your ISP device ? I'm pretty sure that your AX6000 WAN connection to the ISP device is configured as Dynamic IP, right ? If you're connected directly to the ISP...

@DanMR600 If you have troubles accessing the device via Tether app you could configure the Remote Access feature as a fallback: To be able to do that you should be on-site during configuration of...

@Swapnil-123 Why don't you use the Wireless MAC filtering for that purpose: There's an example in the device user guide for this particular scenario - Section 6.4.

@TG06 Have you tried to set the WDS mode like this: A good practice is to set the repeater IP address outside the main router DHCP pool range (e.g. 192.168.1.254) or make an Address Reservation if...

@LCG Try these settings to see if any difference: