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cannot sync from on-prem AD attributes: msExchExtensionCustomAttribute1-5 to Azure AD using Azure AD Connect

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Last Modified: 2019-01-01
Hello Experts. I have Exchange 2013 CU21 with AD2012 R2 on prem. I also have Azure AD connect setup with Exchange hybrid to Office 365, and AD Connect server is syncing the required users and attributes to Azure AD. I am trying to sync the attributes from my on-prem AD: msExchExtensionCustomAttribute1-5 to Azure AD. However i am unsuccessfull in doing so. I see that my Azure AD Connect sync is picking up the new attributes, but it does not update them in Azure AD.
According to this microsoft kb: https://docs.microsoft.com/en-us/azure/active-directory/connect/active-directory-aadconnectsync-attributes-synchronized 
it mentions that these attributes are not consumes by Exchange online, but that means they should still be able to sync to Azure AD...which in my case they are not. Please let me know if anyone was successful syncing these attributes to their Azure AD from on-prem AD. Thanks in advance.
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