When a third-party backup tool fails to backup a virtual machine, but manual creation and deletion of snapshots on the impacted VM are successful, the primary responsibility for investigation and analysis lies with the backup vendor.
VMware support can review the vendor's analysis should an issue be identified within the VMware layer. Additionally, if the vendor suspects an issue with an API call, they should open a B2B ticket with VMware SDK support to troubleshoot any API-related concerns.
vCenter 7.0
vCenter 8.0
ESXI 7.0
ESXI 8.0
The failure of the backup tool to perform backups, despite successful manual snapshot operations, can stem from various factors. It is the responsibility of the backup vendor, potentially in conjunction with SDK support, to identify the cause of the failure.
Engage the backup vendor to determine why the backup is failing.