Orbi RBK353 connection to Dell Latitude E7440

I have recently added the Orbi RBK353 system and all good apart from one thing, I have an old Dell Latitude E7440 laptop which can't see the Wifi, I have read that if I turn off the AX then all would work apart from loosing the Wifi 6 part of the system.  However when I try to switch the AX part off through the router if says that it can't because the WPS is in use, try later.  Up to now having tried many times I keep getting the same response any suggestions.