We have exchange 2016. after renewing ssl cert and the old one expired..... all of a sudden all apple devices 20 - 30 devices (iPhones and iPads) cannot connect to server to retrieve emails with the apple mail app. All android devices are fine. Outlook web app on apple devices works just fine. I am completely Stump on this. I have tried on my iPhone12: resetting network settings, Reboot phone, toggled airport mode, removed account and added back, removed the mail app and reinstalled it I cant be the only one that this has happened to, any suggestions or point me in the right direction to look/trouble shoot this problem. Thank you for any help you can provide.