Outlook Web App Is Currently Disabled For User

A user reported that he can’t login to OWA. He got the message that “Outlook Web App is currently disabled for user KANDTI\sysm1. The details of the error is as follows:

Outlook Web App is currently disabled for user KANDTI\sysm1.

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Url: https://casrp.KANDTI.com.sg:443/owa/auth/error.aspx
User host address: 130.22.126.33
User: zzzz System Monitoring Account
EX Address: /o=KANDTI/ou=KANDTI Admin Group/cn=Recipients/cn=sysm1
SMTP Address: sg1m1@KANDTI.com.sg
OWA version: 14.2.247.5
Mailbox server: CERCO.KANDTI.com.sg

The OWA accessing feature for the account was found to be disabled. The user is able to login to OWA after the below PowerShell cmdlet is issued via the Exchange Management Shell:

Set-CASMailbox –Identity sysm1@CERCO.KANDTI.com.sg –OWAEnabled:$true