User writeback is not currently supported. The product group is working on adding this capability in the future. Right now it is possible to write back passwords and groups, but not users.
Trending on MSDN: Is it possible to write back users from Azure AD to an on-premises Active Directory?

Marilee Turscak-MSFT
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Reputation points Microsoft Employee
Is there a way to write-back users from Azure Active Directory to Active Directory on-premises?
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Jimmy Ståhl 26 Reputation points
2020-08-30T01:28:51.97+00:00 However you build around it with a topology like this if you need to provision user in azure for hybrid env
Azure AD -> Azure AD Domain Services -> forest trust -> On prem ADDS -> Azure AD connect -> Azure AD
That would solve your problem if I understand you correct
https://learn.microsoft.com/en-us/azure/architecture/reference-architectures/identity/adds-forest
https://learn.microsoft.com/en-us/azure/active-directory-domain-services/synchronization