@StefanJ If its BT full fibre with Digital voice you are moving to then as far as I know the BT hub will need to be used in order for digital voice to work, if so then you could use the BT hub as...

@Nicj56 what settings have you tried? Try the below and see, this works for me with BT UK PPPoE and PD of 64.

@Jasper_Kimmel Yes this is possible, you would need to tell the new unit to only connect to the main Deco, this can be done in the connection preference settings on the Deco App.

@rh0b0 In case you want to try removing the Community fibre router, this post is helpful. https://community.tp-link.com/en/home/forum/topic/655644

@internetrocks looking at that last screen shot your ISP router is not in bridge mode and seems to be the router and will be handling your PPPoE connection, in that case change the X20 to access...

On the Deco app, go to wifi settings, then “advanced”, click “security” then choose “none” and then go back to previous screen x2 and click “save”.