Veeam Backup & Replication and Backup Enterprise Manager services
The default deployment option for Veeam Backup & Replication includes a local SQL Server instance for storing the configuration database. Because the included SQL instance is local, all Veeam services can run as Local System(Img #1). However, if during the installation, or at any point after, a SQL Instance on another server was selected, there will be Veeam services that are set to a specific user account to allow access to the database(Img. #2) on the remote server.
Open the Services list (services.msc) on each of the Windows servers used by Veeam, and check if any of the services are listed with a user whose password changed under Log On As.