Forum Discussion

Copper Contributor

Feb 06, 2018

Office 365 - Hybrid migration. How to accepted domains ?

Hi PPls. I have hybrid setup in place and migrated 50% of users to office 365. All looks good. Now i have users from differant accepted domain(primary SMTP address set to differant domain for t...

office 365

NunoAriasSilva

MVP

Feb 06, 2018

Hi,

You will need to do the following:

Validate the domain on Office 365
Add the UPN to onprem
Add the domain to the Exchange Onprem
Do a Delta Synchronization on AADConnect
Run Hybrid Configuration Wizzard to accept new domain
Verify Connectors
Create a test user and test mail flow internally
Change MX record to Office 365
Test mail flow externally
Migrate the test user to Office 365
Create or change the users to the new domain
Migrate Mailboxes to Office 365

Devaraj G

Copper Contributor

Feb 06, 2018

Thanks for the reply.

Accepted domain is already added in on-prem and i have users with that SMTP primary address.

So now, i need to add the domain in azure - > add one more UPN for the domain in on-prem AD -> do a sync -> then add the domain in office 365 ?

is this correct ?

NunoAriasSilva
MVP
Feb 07, 2018
Hi Devaraj,

Validate the domain only on Office 365 you do not need to validate on Azure.

Then add the upn and do a sync.
- Devaraj G
  Copper Contributor
  Feb 07, 2018
  Sorry, I meant,
  
  - Verify the domain in Office 365 for Azure AD sync
  
  - then, add UPN suffice in on-prem AD for the accepted SMTP domain - do the sync
  
  - Adding accepted domain in office 365 exchange online will automatically happen ?
  
  Any other consideration i need to take ?
  - NunoAriasSilva
    MVP
    Feb 07, 2018
    Hi Devaraj,
    
    Yes, that's the process.
    
    After you validate the domain in Office 365 domain's it will be added in Exchange Online.