Authentication failure while backing up to the server

I keep getting an error when trying to perform a file backup using NetworkBackup on a Windows Server 2019 client. The error states:

Authentication failure while backing up to the server.

I have another client that's backing up to the BDR Server just fine. I performed a Settings > Test connectivity to Backup Server and everything passed. I don't have another client configured in the BDR Server with the same name or ip. Any suggestions?

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