@David-TP I finished reading through this thread and see that the special characters was the problem. In my case, I tried changing the password to no contain no numbers and no special characters, and...

Brand new Deco X60, used the app to create a TP-Link ID, set it all up, then changed it to Access Point mode, and everything is working fine. Went in my router, found the DHCP address of the X60,...