Licensing after on-premise migration to Exchange Online

Question

I am in the process of migrating from Exchange on-premise to exchange online. I am setup with a hybrid approach right now and I can successfully migrating mailboxes to Exchange Online. My question is this, when I tried to add an exchange online license to an account PRIOR to migrating, it created a new primary mailbox for the user in Exchange Online which I did not want. So, I removed the license THEN migrated the on-premise mailbox to Exchange Online successfully. I was thinking the license for Exchange Online would be added in the admin portal automatically BUT I still see the user that i migrated without a license for Exchange Online BUT working successfully.

Is the next step to just add the license to the account? Will this effect the current mailbox in any way? Is this the correct process? to not add a license to the user account before migration THEN add it after the mailbox has been migrated to Exchange Online?

Thanks

Answer 1

AADConnect needs to sync the mailbox enabled ExchangeGUID first - before you apply the license.
So, ensure that value is synced before applying the license.
Are you using AADConnect? It should be doing that by default if you enabled the Exchange Hybrid option

https://techcommunity.microsoft.com/t5/exchange-team-blog/my-user-has-a-mailbox-both-on-premises-and-in-exchange-online/ba-p/846809

An Exchange Online license was applied to the user before the Exchange GUID got synchronized from on-premises Active Directory. For synchronized accounts, having the Exchange GUID synchronized from on-premises is used to tell Exchange Online that the mailbox hasn’t been migrated yet, and is what allows customers to pre-license accounts prior to migration.

Answer 2

Actually, under optional features I found Exchange Hybrid checkbox checked, Was that the setting you were referring to? Anything else I should be checking? Any other thoughts on why the AADC wouldn't be syncing that data?

Had one other thought on this, TLS 1.0 was disabled incorrectly on this server a while back, which was causing some intermittant issues. Maybe the Hybrid checkbox got enabled BUT not all the settings went through because of the TLS issue? That issue has since been resolved, would it do anything to uncheck the box and recheck the box? Or is there something in powershell that I can run to check a setting that isn't working?

Thanks

Answer 3

As soon as I can get Exchange Online Powershell working I will check that. Any good articles on how to set that up? Been trying for a couple hours now with no avail, many errors mostly:

PS C:\WINDOWS\system32> Install-Module MSOnline
WARNING: Unable to resolve package source 'https://www.powershellgallery.com/api/v2'.

This looks correct though:
PS C:\WINDOWS\system32> Get-PSRepository

Name InstallationPolicy SourceLocation

---

PSGallery Untrusted https://www.powershellgallery.com/api/v2

Thanks

Answer 4

Seems trivial but not working. If you run the link you offered:

PS C:\WINDOWS\system32> Import-Module ExchangeOnlineManagement
Import-Module : The specified module 'ExchangeOnlineManagement' was not loaded because no valid module file was found
in any module directory.
At line:1 char:1

• Import-Module ExchangeOnlineManagement

Which then points you to install the EXO V2 Module. When I run that, i get this error:

PS C:\WINDOWS\system32> Install-Module -Name ExchangeOnlineManagement -RequiredVersion 2.0.3
WARNING: Unable to resolve package source 'https://www.powershellgallery.com/api/v2'.
PackageManagement\Install-Package : No match was found for the specified search criteria and module name
'ExchangeOnlineManagement'. Try Get-PSRepository to see all available registered module repositories.
At C:\Program Files\WindowsPowerShell\Modules\PowerShellGet\1.0.0.1\PSModule.psm1:1809 char:21

Seems like the process should be easier but maybe I am missing something..

Answer 5

Hi @dtd646 ,

Please open a new powershell window to run the below command first, then you will be able to install the module.

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12  

In addition, note that: if you migrate mailboxes in Exchange hybrid, the official document lists that: The Microsoft 365 or Office 365 Exchange license must be assigned only after the migration is complete. You then have 30 days to assign the license.

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