I've been trying to setup Azure AD Connect password writeback but without any success. It's a complicated thing to diagnose online, so initially I'm looking for confirmation that what I'm trying to do is possible.
Unlike most Azure AD Connect scenarios, I am starting with a small, existing set of Microsoft 365 Business Standard and Premium users. I am then setting up a brand new on-premise domain (Windows Server 2019) and want to allow the equivalent on-premise users accounts to have their password synchronised with Microsoft 365/Azure AD.
Does Azure AD Connect password writeback work in this scenario? i.e. with the original accounts being created in Microsoft 365 and the on-premise accounts being linked to them?
Azure AD Connect: 188.8.131.52
Windows Server 2019 Standard
Licenses: Microsoft 365 Standard & Microsoft 365 Premium
Things I've tried:
Disabling then re-enabling password writeback in Azure AD Connect
Running the PowerShell script suggested here
Looking for errors in the Windows Event Log, and Azure Portal