@vmb 

If you have the option, try forget/delete the wifi network on your device and then re- set it up.

  @ArcherC8 

Dear Sir,

did that many times. there must be some hidden menu for this issue? both My Dune and Kindle say thay cannot not fine the SSID. Very strange, never have I ran into this before.

  @vmb 

that is strange.

I would try using a different wifi channel as it is possible the devices do not work on those channels. 

tried that, no go, still can't find the SSID. just for giggles, I took down the  AX55 and put my Nighthawk router back up and guess what, both my Dune and my Kindle found the Nighthawk.

Thare must be some bug in hte Archer router or some hidden menu where drvices are block (for whatever reason) were you can block them. I spen almost 1 week trying to make the Archer work. Very bizzare