Today IOS 11.X is certified on mobility client 9.6, but not on mobility client 9.52. Our backend is 9.52 and the combinaison of 9.60 client witn 9.52 client is also not certified. We do not have any short term plan to upgrade our backend to 9.60.
We either need a certification of IOS 11.x on 9.52 client or certification of support on 9.60 client 9.52 back-end combinaison.
Ref: support case SD02183882