Hub+ Can't Connect to Exchange 2003 after OS updated to Android N

I am using Sony XP and using blackberry hub for my email. It works perfectly fine with my company email server (exchange 2003). However, it starts not sync any email after i have updated the Andriod OS from M to N. I have tried remove the account and reinstall the hub. But it pop up a error message "can't connect to server" and i'm pretty sure that i have manually input correct setting.
I tried to use the Sony built-in email apps and it works fine. does anyone share the same problem? Hub is a great app i don't want to lose it.