Windows 10: Azure AD connect1.6 running in server 2012

Hi,we have Exchange 2016 Hybrid server running in Windows server 2012 R2 server in Virtual Enviroment VMware. this server also has Azure AD connect V1.6 is running in this server.our Domain controller is Server 2019 in seperate server.Question 1:Now we could not upgrade this Azure AD connect V1.6 to V 2.0, becuase minimum requirement is Server 2016 or Serve 2019. I want to know that if I do an inplace upgrade of this server windows2012R2 to server 2016 then upgrad this server from 2016 to Server 2019. once this server is upgraded to Server 2019, can I able to update this Azure AD connect fro

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how to install Azure AD connect on a new server and decommission the old version on existing server.

I am unable to upgrade the Azure AD Connect from Ver. 1.6.16.0 to the latest version due to an unsupported server (i.e., Windows server 2012 standard).

I am planning to install the higher version of AD connect on another server (Windows server 2016) and decommission the old one. Could you please help to provide the steps for smooth migration please?

 

Server 2012

IF you want to try seizing the FSMO roles to see if it will help, here is a quick guide (this should be done on the DC you want to keep):

https://blogs.technet.microsoft.com...ation-master-roles-in-windows-server-2012-r2/

Knowing that this is a DC now I'm really convinced that something is wrong with the AD account for this particular server. It's possible that the promotion to a DC didn't work correctly leaving you with a sort of broken DC.

A reboot is always worth a shot; has that been tried Ahhzz? If it has, then the next step would be to demote this DC and rejoin it to the domain. Once rejoined you can run DCPromo again. Microsoft best practice is to have at least 2 DCs for redundancy.

 

Server 2012

Also don't forget to reset the account in AD Users and Computers to avoid any SID issues.