The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.
Hi @BH Yeo
What's your Exchange server version?
I would recommend you firstly try using the solution provided in this link to change the status "access denied" for the mobile device from Exchange server side.
Solved Access Denied, when adding a mobile device to Office 365
If it still doesn't help. It's better to contact MobileIron for further help. Thanks for your understanding!
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