Couldn't Get Address For Cloud_assist_1_3_1.dmg Not Found

When customers desire to move a domain from one tenant to another or decommission a domain within a tenant all dependencies on that domain must be removed. The domain removal process relies on the information contained within Azure Active Directory in order to determine if a domain is safe to be removed. One of the most common dependencies are email addresses on mail enabled objects. The removal of the email address dependencies may occur either on premises and be replicated through Azure AD Connect or directly in Exchange Online.

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When Office 365 groups are utilized in the environment we have to take a different approach to domain removals. Proxy addresses for Office 365 groups are managed directly in Exchange Online. This includes the addition, removal, or adjustment of these proxy addresses. When a proxy address is modified on an Office 365 group in Exchange Online – this change does not back sync to Azure Active Directory. Therefore when administrators attempt to process a domain removal they are presented with errors indicating that groups with a domain dependency exist.

To remove this domain, you'll have to remove the following dependencies first. You can manually remove dependencies yourself, or we can try to automatically reconfigure them for you. Please be aware that distribution lists and mail-enabled security groups cannot be automatically moved. You must manually delete or place them under a different domain.

If address removal does not sync to Azure Active Directory, and Azure Active Directory is the source of domain removals, then how do we process a domain removal when Office 365 Groups are utilized. Let’s review a typical scenario.

I have an Office 365 Group TestDomainRemove0.

PS C:> Get-UnifiedGroup TestDomainRemove0

Name Alias ServerName AccessType
---- ----- ---------- ----------
TestDomainRemove0_cfd5.. TestDomainRemove0 dm5pr06mb2377 Public

The proxy addresses on the group can be verified using the following command:

PS C:> $addresses=Get-UnifiedGroup TestDomainRemove0
PS C:> $addresses.EmailAddresses
smtp:[email protected]
smtp:[email protected]
smtp:[email protected]
SMTP:[email protected]

Post configuration I added several other email addresses to the Office 365 Group using powershell.

As with many mail enabled objects the Exchange Online Object is mirrored by a corresponding object in Azure Active Directory. Using the get-MSOLGroup command we can locate the group.

PS C:> Get-MsolGroup -SearchString TestDomainRemove0

ObjectId DisplayName GroupType Description
-------- ----------- --------- -----------
992878ca-89e5-43fd-a2bf-3c9eb4d6feba TestDomainRemove0 DistributionList

The original primary email address stamped on the group is now present on the object in Azure AD. NOTE that none of the additional addresses I added are present in Azure Active Directory.

PS C:> $msolAddresses.EmailAddress
[email protected]

This example highlights the core issues at this time –> proxy address changes DO NOT propagate from Exchange Online to Azure Active Directory.

OPTION #1: Delete the group in Exchange Online.

In option 1 we are not worried about retaining any of the data associated with the Office 365 Group. Therefore we can remove the address dependency by removing the group. The group can be removed using the remove-unifiedGroup command.

Remove-UnifiedGroup TestDomainRemove4 -Confirm:$FALSE

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When removing the group in Exchange Online this operation should successfully synchronize into Azure Active Directory. Using the get-msolGroup command and finding no group returned to the query confirms this.

PS C:> Get-MsolGroup -SearchString TestDomainRemove4
PS C:>

Removing the group has successfully removed the dependency on the address. The removal operation is not reversible. THE DATA IS NOT RECOVERABLE ONCE THE REMOVAL HAS SUCCEEDED.

Option #2: Delete the group in Azure Active Directory using Azure Active Directory Shell v1 (Microsoft Online Services Shell).

In option 2 we are not removing the group in Exchange Online but rather removing it through Azure Active Directory using the MSOL commands provided in the v1 Azure Active Directory powershell. In order to prevent any administrative mistakes I prefer to search for the group first and locate it’s object id.

PS C:> Get-MsolGroup -SearchString TestDomainRemove2

ObjectId DisplayName GroupType Description
-------- ----------- --------- -----------
d6e64513-f601-4731-9e17-a1160c022f46 TestDomainRemove2 DistributionList

When the object ID has been located it can be combined with the Remove-MSOLGroup command to remove the group from Azure Active Directory.

For


PS C:> Remove-MsolGroup -ObjectId d6e64513-f601-4731-9e17-a1160c022f46 –Force

The group removal will replicate into Exchange Online.

PS C:> Get-UnifiedGroup TestDomainRemove2
The operation couldn't be performed because object 'TestDomainRemove2' couldn't be found on
'CO1PR06A002DC06.NAMPR06A002.prod.outlook.com'.
+ CategoryInfo : NotSpecified: (:) [Get-UnifiedGroup], ManagementObjectNotFoundException
+ FullyQualifiedErrorId : [Server=BY1PR0601MB1402,RequestId=687793e0-65a9-43b0-a4db-ed34f4a2eb89,TimeStamp=1/17/20
18 4:08:52 PM] [FailureCategory=Cmdlet-ManagementObjectNotFoundException] 7FF5681F,Microsoft.Exchange.Management.R
ecipientTasks.GetUnifiedGroup
+ PSComputerName : ps.outlook.com

Removing the group has successfully removed the dependency on the address. The removal operation is not reversible. THE DATA IS NOT RECOVERABLE ONCE THE REMOVAL HAS SUCCEEDED.

When considering options both Option 1 and Option 2 do not provide any form of data preservation. In many cases it is desired to retain the original data until it can be migrated or it has been determined after the domain removal that it is no longer necessary. There are also other cases where the domain removal is not tied to the deletion or migration of data – it’s simply just being administratively removed. Are there any options that allow us to preserve the data.

Option #3: Remove and restore the groups using Azure Active Directory Shell v2 Preview:

In order to restore Office 365 Groups the Azure Active Directory Preview modules must be utilized. These modules can be installed online using an administrator initiated powershell session.

PS C:> Install-Module AzureADPreview

Untrusted repository
You are installing the modules from an untrusted repository. If you trust this repository, change its
InstallationPolicy value by running the Set-PSRepository cmdlet. Are you sure you want to install the modules from
'PSGallery'?
[Y] Yes [A] Yes to All [N] No [L] No to All [S] Suspend [?] Help (default is 'N'): y

Once the powershell module has been installed a connection to Azure Active Directory can be established.

PS C:> Connect-AzureAD -Credential $cred

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Account Environment TenantId TenantDomain AccountT
ype
------- ----------- -------- ------------ --------
[email protected] AzureCloud eefdeca8-5850-4ca5-a160-0716f2d8496e domain.org User

In order to perform a recoverable deletion of a group we need the object IDs of the groups to be removed. I find that it’s less likely to make a mistake of the object IDs are obtained from Exchange Online.

PS C:> Get-UnifiedGroup where{$_.name -like 'TestDomain*'} Select-Object name,externalDirectoryObjectID

Name ExternalDirectoryObjectId
---- -------------------------
TestDomainRemove0_cfd54e2557 992878ca-89e5-43fd-a2bf-3c9eb4d6feba
TestDomainRemove1_d49d89822c 931c9e3b-3f27-4304-b13b-a3289d6b2b42

The external directory object ID attribute represents the GUID of the object in Azure AD. Using these object IDs we can remove the groups from Azure Active Directory.

PS C:> Remove-AzureADMSGroup -Id 992878ca-89e5-43fd-a2bf-3c9eb4d6feba -Verbose
PS C:> Remove-AzureADMSGroup -Id 931c9e3b-3f27-4304-b13b-a3289d6b2b42 –Verbose

The above command removes from the group Azure Active Directory and places the group in a soft deleted state.

PS C:> Get-AzureADMSDeletedDirectoryObject -Id 992878ca-89e5-43fd-a2bf-3c9eb4d6feba

Id DisplayName Description
-- ----------- -----------
992878ca-89e5-43fd-a2bf-3c9eb4d6feba TestDomainRemove0

The group deletion will propagate into Exchange Online and the other Office 365 properties that offer group services.

PS C:> Get-UnifiedGroup TestDomainRemove0
The operation couldn't be performed because object 'TestDomainRemove0' couldn't be found on
'CO1PR06A002DC06.NAMPR06A002.prod.outlook.com'.
+ CategoryInfo : NotSpecified: (:) [Get-UnifiedGroup], ManagementObjectNotFoundException
+ FullyQualifiedErrorId : [Server=BY1PR0601MB1402,RequestId=d041eaa4-b364-4848-a144-2727b01a367d,TimeStamp=1/17/20
18 4:24:43 PM] [FailureCategory=Cmdlet-ManagementObjectNotFoundException] 7FF5681D,Microsoft.Exchange.Management.R
ecipientTasks.GetUnifiedGroup
+ PSComputerName : ps.outlook.com

When the Office 365 Groups are in a soft deleted state their proxy addresses do not count against the domain removal dependency. Assuming that all other pre-requisites were met the domain should now remove without issue. When the domain removal has proceeded successfully the groups can be restored. The restoration starts in Azure Active Directory.

PS C:> Restore-AzureADMSDeletedDirectoryObject -Id 992878ca-89e5-43fd-a2bf-3c9eb4d6feba

Id DisplayName Description
-- ----------- -----------
992878ca-89e5-43fd-a2bf-3c9eb4d6feba TestDomainRemove0


PS C:> Restore-AzureADMSDeletedDirectoryObject -Id 931c9e3b-3f27-4304-b13b-a3289d6b2b42

Id DisplayName Description
-- ----------- -----------
931c9e3b-3f27-4304-b13b-a3289d6b2b42 TestDomainRemove1

When the groups have been restored the restored objects can be viewed in Azure Active Directory.

PS C:> Get-AzureADMSGroup -Id 992878ca-89e5-43fd-a2bf-3c9eb4d6feba

Id DisplayName Description
-- ----------- -----------
992878ca-89e5-43fd-a2bf-3c9eb4d6feba TestDomainRemove0

The restoration will propagate into Exchange Online and the other related Office 365 properties where group services are offered.

PS C:> Get-UnifiedGroup TestDomainRemove0

Name Alias ServerName AccessType
---- ----- ---------- ----------
TestDomainRemove0_cfd5.. TestDomainRemove0 dm5pr06mb2377 Public

Using this method the domain dependencies were removed and the restoration process retained the data associated with the groups after domain removal.

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