please check the link.
https://learn.microsoft.com/en-us/azure/active-directory/hybrid/plan-hybrid-identity-design-considerations-identity-adoption-strategy
Does Azure AD Connect support syncing from two domains to an Azure AD?
Marilee Turscak-MSFT
33,951
Reputation points Microsoft Employee
Does Azure AD Connect support syncing from two domains to an Azure AD?
Source: https://learn.microsoft.com/en-us/azure/active-directory/hybrid/reference-connect-faq
3 answers
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Abhijeet-MSFT 541 Reputation points Microsoft Employee
2020-10-10T17:00:33.1+00:00 You can also refer https://learn.microsoft.com/en-us/azure/active-directory/hybrid/plan-connect-topologies#multiple-forests-single-azure-ad-tenant for a more detailed information on the AD Connect topology.
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Ryan Hill 25,826 Reputation points Microsoft Employee
2019-10-29T23:54:18.843+00:00 Yes, this scenario is supported. Please refer to Multiple Domains.
Source: https://learn.microsoft.com/en-us/azure/active-directory/hybrid/reference-connect-faq