Forum Discussion

AtanasM's avatar
AtanasM
Iron Contributor
May 31, 2020
Solved

Some On Premise mailboxes are provided with wrong external email address in Office 365

In some OnPremise mailboxes, the associated “mail users” in O365 are provided with the wrong external email address. The target address for mail users is set wrong by Azure AD Connect. Our customer...
Azure Active Directory (AAD)
Identity Management
Microsoft 365
  • PeterRising's avatar
    PeterRising
    Sep 20, 2020

    Jjsilva AtanasM 

     

    Apologies, I lost track of this issue.  The reason that the email address could not be changed is the Source of authority is on-premises AD, not Azure AD.  To change this email address you would need to do so from the on-premises Exchange Admin Centre, not the Exchange Online one.

AtanasM's avatar
AtanasM
Iron Contributor
Jun 03, 2020

Hi PeterRising do you mean in Active Directory?

Please provide the path how to check  this.

Thanks in advance.

PeterRising's avatar
PeterRising
MVP
Jun 03, 2020

AtanasM 

 

Do you not have an on premises Exchange Server?

  • Jjsilva's avatar
    Jjsilva
    Copper Contributor
    Sep 25, 2020

    PeterRising Hello the problem is when the on-premise user is sync to cloud it gets the wrong external smtp address although the upn of the user is correct with the mailto:example@doamin

  • PeterRising's avatar
    PeterRising
    MVP
    Sep 20, 2020

    Jjsilva AtanasM 

     

    Apologies, I lost track of this issue.  The reason that the email address could not be changed is the Source of authority is on-premises AD, not Azure AD.  To change this email address you would need to do so from the on-premises Exchange Admin Centre, not the Exchange Online one.

  • Jjsilva's avatar
    Jjsilva
    Copper Contributor
    Sep 19, 2020

    AtanasM I'm with the Sam issue , did you get the solution ?

     

  • AtanasM's avatar
    AtanasM
    Iron Contributor
    Jun 03, 2020

    PeterRising There are 2 Exchange servers. Please check the screenshot.
    The main problem is that, some on prem mail users are shown with wrong "external email address" in "Contacts" in Exchange Admin Center. The wrong email address is the secondary email address which ends with @domain.mail.onmicrosoft.com.
    When trying to edit manually the external email address, it comes the following error message:
    "The operation on mailbox failed because it's out of the current user's write scope.
    The action ‘Set-MailUser’, ‘ExternalEmailAddress’, can’t be performed on the object because the object is being synchronized from your on-premises organization".