@Lim Chong Sun In the connectivity part, you need to enter the creds for a Global administrator and it can be different than the last one used for the setup.
You will also need a AD DS Enterprise admin account. Again this can be different from the last setup.
For thorough permission check, please visit this : https://learn.microsoft.com/en-us/azure/active-directory/hybrid/reference-connect-accounts-permissions#ad-ds-enterprise-admin-credentials
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