Issues removing alias from mailbox

Question

Issues removing alias from mailbox

Lukas Helmers 20

Good afternoon, I'm working on an issue where O365 SSO fails for a user because of an alias that exists on their account. They can log in other ways with this account but have issues with SSO because of this alias. I see the alias on the O365 admin console not able to remove it from the O365 console. But in the exchange admin console, I don't see it. I logged into our exchange server with my domain admin credentials and tried using the Set-mailbox in the Exchange Management shell but I'm getting an error it couldn't find the user on the domain controller. I've also tried fully qualifying the user name to no avail. Any ideas?

Domain Controller: 2022

Exchange 2016

 C:\Windows\system32>Set-Mailbox -Identity "Jennifer" -EmailAddresses @{remove="kwebb"}
The operation couldn't be performed because object 'Jennifer' couldn't be found on 'domain controller'.
    + CategoryInfo          : NotSpecified: (:) [Set-Mailbox], ManagementObjectNotFoundException
    + FullyQualifiedErrorId : [Server=EXCHANGE,RequestId=ae30b3d0-0c7c-4747-89c7-42e276db0d1c,TimeStamp=10/9/2023 5:48
   :59 PM] [FailureCategory=Cmdlet-ManagementObjectNotFoundException] BF536209,Microsoft.Exchange.Management.Recipien
  tTasks.SetMailbox
    + PSComputerName        : exchange.mbsbooks.com

Jarvis Sun-MSFT 10,291 Reputation points Microsoft External Staff

2023-10-18T05:51:23.6733333+00:00

I wanted to follow up and know if the below responses helped in answering your query. If it did, please do not forget to accept the appropriate response as Answer so that others in the community facing similar issues can easily find the solution.

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Jarvis Sun-MSFT 10,291 Reputation points Microsoft External Staff

2023-10-18T05:51:23.6733333+00:00

I wanted to follow up and know if the below responses helped in answering your query. If it did, please do not forget to accept the appropriate response as Answer so that others in the community facing similar issues can easily find the solution.

Answer 1

Jarvis Sun-MSFT 10,291 Microsoft External Staff

Hi @Lukas Helmers ，

Welcome to post in our Q&A forum.

Based on your description, it is possible that the user account is not synced properly between your on-premises Active Directory and Azure Active Directory. I suggest checking if the user account is synced correctly and if there are any errors in the synchronization process.

You may also want to try removing the alias from your on-premises Active Directory by following these steps:

Open Azure Active Directory and select the user account you would like to edit.
Select Properties > Attribute Editor > Proxyaddresses and add the required alias.
Wait for it to sync to Azure Active directory.

If there are any updates, feel free to let us know.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Lukas Helmers 20 Reputation points

2023-10-11T14:53:53.77+00:00

Is there a way for me to pull the aliases from the Exchange Management Shell? I've tried numerous times and I get the connectivity issue.
Jarvis Sun-MSFT 10,291 Reputation points Microsoft External Staff

2023-10-13T07:22:53.6966667+00:00

@Lukas Helmers

Run the following command: Get-Mailbox -Identity <MailboxIdentity> | Select-Object -ExpandProperty EmailAddresses | Where-Object { $_.PrefixString -ceq 'smtp' } | ForEach-Object { $_.SmtpAddress }
Lukas Helmers 20 Reputation points

2023-10-13T13:23:25.6+00:00

Thanks for the command quick question. It's failing to connect and search my domain controllers for the query. Is there something I can do to fix that connection?
Jarvis Sun-MSFT 10,291 Reputation points Microsoft External Staff

2023-10-16T08:55:38.56+00:00

Do you have multiple Domain Controllers in your AD Environment? If so then use -DomainController parameter with all of your commands and give some other Domain Controller than the one you are having problem.

For example, you can try running Set-Mailbox YourMailboxID -DisplayName NewDisplayName -DomainController SomeOtherDCFQDN.
Lukas Helmers 20 Reputation points

2023-10-18T13:59:03.14+00:00

We have multiple Domain Controllers. We're in the process of a DC promotion going from 2012 to 2022. And even when I put one of the older domain controllers I get an error of not being able to do anything. Every command seems to have the same error and affect.
Jarvis Sun-MSFT 10,291 Reputation points Microsoft External Staff

2023-10-20T01:58:00.0166667+00:00

Hello@Lukas Helmers , please try again until the DC promotion process is complete.
Lukas Helmers 20 Reputation points

2023-10-20T13:04:09.58+00:00

Is there something firewall-related on the domain controllers or Exchange I need to do to help with the connectivity?
Jarvis Sun-MSFT 10,291 Reputation points Microsoft External Staff

2023-10-25T07:47:45.3466667+00:00

Yes, there are firewall ports that need to be opened between domain controllers and Exchange servers to ensure proper communication. According to Microsoft Q&A, all ports must be open between Exchange and the domain controllers to be supported.
Jarvis Sun-MSFT 10,291 Reputation points Microsoft External Staff

2023-11-02T02:13:00.41+00:00

Hello@Lukas Helmers , I am writing here to confirm with you how the thing going now?

If you need further help, please provide more detailed information, so that we can give more appropriate suggestions.

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Issues removing alias from mailbox

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