With the customer I am currently working with, we discovered an issue with Secure Mail for Android.

Issue

New Secure Mail provisioning or setup fails to connect to Office 365 accounts with the following error:

“Error : Cannot Connect to server”

Solution
This is resolved with Secure Mail for Android version 10.7.15 or later.
Refer to the What’s Fixed in XenMobile Apps.

Problem Cause
Cause for the Issue :
After the Latest update from Microsoft on Office 365, Secure Mail in Android fails to connect.
This only impacts certain Tenants on Office 365.
We have tested with the updated version of Secure Mail 10.7.15 and it works like a charm, instant access to Exchange Online.
Hope it can help others.