Before going further, it would be helpful if you can confirm the status of the DCs with the following command ：
Dcdiag /v >c:\dcdiag1.log
Repadmin /showrepl >C:\repl.txt
Repadmin /showreps *
Repadmin /syncall /APeD
Then confirm if there are any related events .
If there are any error messages , you can share a screenshot here (Please hide the private information)!Note,it is not recommend sharing the logs here due to the security reason.