Your network contains an Active Directory forest. The forest contains two domains named contoso.com and adatum.com.
Your company recently purchased a Microsoft 365 subscription.
You deploy a federated identity solution to the environment.
You use the following command to configure contoso.com for federation.
Convert-MsolDomaintoFederated -DomainName contoso.com
In the Microsoft 365 tenant, an administrator adds and verifies the adatum.com domain name.
You need to configure the adatum.com Active Directory domain for federated authentication.
Which two actions should you perform before you run the Azure AD Connect wizard? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.
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The correct answer is: C, E.
First you need to remove the relying trust. And you need to run update-MSOLFederatedDomain. After that, you need to run convert-MSOLDomaintoFederated to add additional domains.
It's explained in this article (scroll towards the part that explains what to do when you created a federated domain without the "-SupportMultipleDomain" option).
https://www.msazureteam.com/?p=32