Migrate 3 domains to one tenant.

MAS
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I have 3 locations with each site has their own domain/DCs (Separate Forest).
1 location in hybrid with Office, Other 2 locations are in Gsuite.
Now I need to move everything to one tenant in office 365.
How can we merge all these to one tenant?
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Commented:
do you want to keep 3 separate domains in one tenant ? as existing scenario ?

yes you can do this..

if you wnat to move users to office365 single domain on the tenant then just Export users to CSV change domain name and import on the azure domain.

if you want to make hybrid then you have to configure Azure AD Hybrid configuration on each domain

all the best
MASEE Solution Guide - Technical Dept Head
Most Valuable Expert 2017

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Commented:
Thanks for your reply.
-->do you want to keep 3 separate domains in one tenant ? as existing scenario ?
Do you mean we can have one 3 hybrid configurations with one tenant?

Commented:
it's up to you ...how you want to manage all sites... if all sites are related to same org..better make it under one forest in azure.

all the best
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MaheshArchitect
Distinguished Expert 2018

Commented:
More info is required?

all will undergo single smtp domain? OR need separate domain?

U want to use Azure AD connect to sync identities from each forest or standalone cloud only IDs will work?
IF AD integration is required, then other two forests must be added to existing AD connect tool in domain where hybrid is configured
Configuring 3 hybrid environments with single O365 tenant is bad idea when you don't have exchange in those forests

In any case you do need to use 3rd party tool like BitTitan to migrate mailbox data from G-Suite to O365
MASEE Solution Guide - Technical Dept Head
Most Valuable Expert 2017

Author

Commented:
-->all will undergo single smtp domain? OR need separate domain?
Separate domains

-->IF AD integration is required, then other two forests must be added to existing AD connect tool in domain where hybrid is configured
only one in hybrid others are only cloud and sync AD as of now.

They just want to have only one office365 account but with separate admins for each location.
MaheshArchitect
Distinguished Expert 2018

Commented:
"only one in hybrid others are only cloud and sync AD as of now."

So other two forests have their seperate ad connect servers which sync to same tenant?

That scenario is not supported I believe..

All forests should sync thru single azure ad connect server

Of course each domain will have own admins
Each domains should be added to tenant as verified domains

OR

It might be already added...
MASEE Solution Guide - Technical Dept Head
Most Valuable Expert 2017

Author

Commented:
-->So other two forests have their seperate ad connect servers which sync to same tenant?
They are not in O365 they are using Gsuite as of now. Only one with hybrid is in O365 with ADConnect.
MaheshArchitect
Distinguished Expert 2018

Commented:
Then as already stated both forests must be added to existing AD connect tool

and

U need to use 3rd party tool for G-Suite to O35 migration - I have used Bit-Titan for same

Mail flow need to be setup between Gmail and O365 for co-existence

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