I think our problem is similar to the one below but as it is a different error I will start a new thread and hopefully we can resolve both issues:
Log Name: Directory Service
Source: Microsoft-Windows-ActiveDirectory_DomainService
Date: 10/03/2021 09:55:53
Event ID: 1555
Task Category: Replication
Level: Information
Keywords: Classic
User: ANONYMOUS LOGON
Computer: dc01.domain.local
Description:
This directory server will not be available to clients until it has completed an initial synchronization of each writeable directory partition that it holds. At this time, these initial synchronizations have not been completed.
The synchronizations will continue.
Event Xml:
1555
0
4
5
0
0x8080000000000000
16187
Directory Service
dc01.domain.local
Our other DCs are down but this one holds the FSMO roles - there is a registry setting to confirm the domain is valid but I cannot remember what it is or where to find it!!! 😣 😣