Add domain to Azure AD Cloud Sync. Error: A constraint violation occurred.

[KevinLutz]

Configuring Azure AD Cloud Sync agent (AADConnectProvisioningAgentSetup.exe) when adding another child domain I get the following error after pressing 'Confirm'.  (Error while configuring permissions on gmsa. Error: A Constraint violation occurred.) I successfully added two domains without error.

Any help will be highly appreciated.

[#2 · Accepted solution]

make sure that you have met all the prerequisites on your new child domain. refer to the below document.

https://github.com/MicrosoftDocs/azure-docs/blob/main/articles/active-directory/cloud-sync/how-to-pr...

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[#3]

Sorry for the late reply. We did have a permissions issue in our child domain. Thank you for your help.