Migrating my exchange 2016 on-premise mailbox to Office365- Exchange online my iPhone asked me to log off mobile outlook app? cannot reconnect to my Office365 mailbox

Adam Anderson
Adam Anderson used Ask the Experts™
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After Migrating my exchange 2016 on-premise mailbox to Office365- Exchange online my iPhone asked me to log off mobile outlook app, But could not reconnect to my mailbox in Office365. we are running in Hybrid Configuration.

What Troubleshoot steps should i do to fix this issue.?
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MASEE Solution Guide - Technical Dept Head
Most Valuable Expert 2017

Commented:
When you migrate a mailbox from onpremise to cloud you have to reconfigure on mobile.
Adam AndersonInfrastructure/Cloud Consultant

Author

Commented:
manually?
MASEE Solution Guide - Technical Dept Head
Most Valuable Expert 2017

Commented:
-->manually?
if you have autodiscover configured properly no need to configure manually, Type email address and password would be enough.
Adam AndersonInfrastructure/Cloud Consultant

Author

Commented:
autodiscover is setup on internal and external I have tested via Microsoft remote analyser
Adam AndersonInfrastructure/Cloud Consultant

Author

Commented:
the mail server in the mobile outlook configuration is mail.mycompany.com which is pointing to internal case server, externally it's NATed but going to the same internal cas server
Adam AndersonInfrastructure/Cloud Consultant

Author

Commented:
on windows laptop all works fine just enter email address and password but on iphones internal or external has this problem.
Adam AndersonInfrastructure/Cloud Consultant

Author

Commented:
after talking to MS this is normal behaviour in a hybrid environment with mobile Outlook iOS app
EE Solution Guide - Technical Dept Head
Most Valuable Expert 2017
Commented:
I have configured hybrid and its working without issue.
Anyway glad to know you sorted out.
Thanks for sharing your feedback.
:))

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