Hi,
The error message is too general and it is practically impossible to understand what is wrong.
It seems that you have modify the service account.
Have you found error logs 7000 and 7041 or another?
Please note if it is Windows Server Essentials(WSE) SKU, some limitations should be noticed:
- WSE must be PDC of domain which holds all FSMO roles.
- It supports up to 25 user accounts and 50 devices.
- There can be only one WSE on your domain.
If you need to add WSE to existing domain environment, you must take special steps to promote it.
Please reference “Deploying Windows Server 2012 R2 Essentials in an Existing Active Directory Environment” for detail steps and make sure that you had followed the steps to add WSE to existing domain:
https://blogs.technet.microsoft.com/sbs/2014/02/21/deploying-windows-server-2012-r2-essentials-in-an-existing-active-directory-environment/
Hope this helps and please help to accept as Answer if the response is useful.
Best Regards,
Carl