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Hi Glem,
“Is it a requirement that the ADConnect server must be a member server of a domain for multiple forest?”
Do you mean whether the sync server should be domain-joined? If so, the answer is yes. The sync server on which the AADConnect tool is installed needs to be domain-joined.
About your further description, my understanding is that you’re having difficulties adding the second forest to the AADConnect configuration. Is it true that you haven’t set up the trust relationship between the second forest and the first one? If yes, please set up the trust relationship. It is required for multi-forest synchronization scenario.
Let me know if you have any further concerns.
Thanks,
Allen