@Derocorp You have to be careful when you're buying Archer AX20. Up till HW v3 it supports VPN Client feature. HW v4 doesn't support it according to its datasheet and its user guide. On the other...

@jimi52 Reset the RE500X to its factory defaults and re-configure from scratch. To reset the RE500X push its reset button for about 10 seconds (use a pin).

@nuclearjames IP Passthrough function is to use for example a 3-rd party mesh system behind it - check this article - <https>://help.sonic.com/hc/en-us/articles/1500000066642-BGW320 Using IP...

@5YearWinter You'ill need an mesh system (like Deco or Easymesh) to be able to use it with bgw320-505 router. It's IP Passthrough function is to use for example a 3-rd party mesh router behind it -...

@Veraducks What error message did you receive during setup ? When connected by ethernet cable to your router the RE should be in AP mode. Did you try this video guide - it's the WPS method.

@Notryt It could be either the cable or the switch - refer this document - Q6.