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Our customer is having an issue with Microsoft Azure online sync with on-prem. They are trying to set up a user, and they are able to log in as the user but not access the mailbox. It shows that they are missing information in the SMTP area. The user's.onmicrosoft.com address is completely incorrect as well.
Hi,
Please provide the detail information on the configuration of Azure AD Connect, version, attributes and whether the domain is registered and verified in Azure Portal and in the Azure AD Connect configuration. Is the setup Hybrid Exchange or just O365? This will help us to understand the issue and provide a resolution.
Please check the design concepts over here plan-connect-design-concepts
Please check the “targetAddress” attribute in Active Directory if this is reflecting the correct email address