R6300 v2 Router no longer connects to Apple devices

My R6300 v2 router will not connect to any of our Apple devices (2 cell phones and an iPad).  I am using the router as an Access Point with a ZTE MF 279 router.  I had no problem connecting to Apple devices until after a recent iOS update.  When I try to connect an Apple device I get a Incorrect Password message.  I've carefully checked the router to ensure I'm entering the correct password and that I'm entering the password correctly.  Any thoughts on solutions would be very much appreciated.

Thanks,

Greg