Connect two Active Directories together

[AugustusBuckman]

Hi,

I have two seperate active (atom.local and npi.local) these active directories have a specific group of users whom exist on both servers. 

I want to be able to sync these two ADs together so that users can log on to systems belonging to both ADs.

[#2]

You are probably going to have to setup a Full Two Way Transitive Forest Trust between the two forests. I don't know of anything that will "sync" the users between them. You can do an Active Directory Migration, but that would be if you wanted to collapse one and move all the others into a single forest.

https://learn.microsoft.com/en-us/entra/identity/domain-services/concepts-forest-trust