User account across multiple domains

Hi all i would like to have a user account in one domain and use it with another domain. If possible i would like to only have one account for each user but have access to both domain.

what would be the best way to configure

many thanks
LVL 15
cwstad2Asked:
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Cliff GaliherCommented:
This is precisely the scenario that "trusts" are for.  You can tell one domain to "trust" another. And managing resources becomes basically the same process, and accounts are still a single source of authority (no oddball syncing, etc.)
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Sajid Shaik MSr. System AdminCommented:
if all domains are part of single forest then it's easy ...

other option if multiple forest...for SSo multiple forest can achieve using Azure AD..by replicating all forests to single azure ad
see the following article
https://davidsampson10.wordpress.com/2015/11/11/adfs-authentication-flow-with-multiple-forests/

all the best
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Ganesamoorthy STech LeadCommented:
Would recommend to create Trust between Domain and then user can use both the Domains resource
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