iPhone won't connect to Orbing router

I have Orbi Pro - SRR60 with 2 satelites (one of them is the outdoor)

Netgear have updated my Firmware to the latest - BUT the iphone (Xs) wotn connect , now will my iPAD (3rd gen Pro) . The other iphones in the family connect, as do other devices such as SONOS speakers , iMac, windows laptops etc. 

Totally at a loss to know whay they wont conenct!