Hello,
If you have extened the attribute in your AD schema, you should be able to add the attributes from AAD connect directory extensions: https://learn.microsoft.com/en-us/entra/identity/hybrid/connect/how-to-connect-sync-feature-directory-extensions
If you are checking for cloud extensions, you can find reference with the below docs:
PowerShell
MS Graph
https://learn.microsoft.com/en-us/graph/api/resources/extensionproperty?view=graph-rest-1.0
Best Regards,
Ian Xue
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