Jenkins git actions appear as author unknown

Jenkins version: 2.504.3
We use Jenkins basically to execute actions between GH repositories and Salesforce instances.

We have a new Jenkins server, that is a replica of another one, which is currently working as expected. The new one will be used to balance the workload, and as a backup in case the other one have any issue.
They have the same configuration, and both are working fine, but we have seen that when the new one is generating commits and merges in the repository, the author appears as unknown.
We have reviewed and everything is the same in both servers. We have even executed git config --global username command, and configured the Git Plugin user.name value in the new server, even when they are empty in the old server, but it is still showing unknown.

How could we configure it to reflect the Jenkins server name as the author?

Regards,
Javier Carvajal