Cannot Login Outlook Web Access with UPN Suffix

Posted: June 29, 2015 in Windows

I have problem when try to login OWA with UPN Suffix, if I login with domainusername or username the result is success to logon. But login with UPN Suffix ( always failed (error below)


I check from active directory my logon name is, so this root cause why I can’t logon with

I must add UPN Suffix to active directory domain trust because the name logon is different.

1. Open active directory domain and trust –> right click –> Properties


2. Add alternative UPN Suffixes


3. Open Active Directory Users and Computers –>  User –> select user –> Properties  Account. Change to


4. Try to logon OWA with


CMIIW, Thanks Smile

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