Hi @Aziz Husain ,
"DPM" 12.0.332.0 is Microsoft Azure Backup Server v2 which is based on DPM 2016 UR2, as far as I know it does not support SQL Server 2019.
You might want to consider upgrading your Microsoft Azure Backup Server (MABS) to v3 and/or MABS v3 Update Rollup 1, they support backing up SQL Server 2019.
Azure Backup Server V3 RTM protection matrix
https://learn.microsoft.com/en-us/azure/backup/microsoft-azure-backup-server-protection-v3
MABS (Azure Backup Server) V3 UR1 protection matrix
https://learn.microsoft.com/en-us/azure/backup/backup-mabs-protection-matrix
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Best regards,
Leon