SCV fails to update the SnapVault due to REST API Invoke error

• Backups that trigger SnapVault fail to do so with the following errors in the protection service's Job-<JobID>.log:

[ERR]System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
 --->System.NullReferenceException: Object reference not set to an instance of an object.
   at NetApp.DataProtection.Storage.CommandAPI.SDK.NestedCall.NcSnapmirrorRestInterface.SnapmirrorUpdateOutputRestResponse(JTokenrecord, NcRestInterface ncRestInterface)
[DBG] [Request Method]: POST
[ERR] Failed to run a command Invoke-NcSnapmirrorUpdate
[DBG] ex.Message : Object reference not set to an instance of an object.
[DBG] [Response Location Header]:/api/snapmirror/relationships/<RELATIONSHIP_UUID>/transfers/<TRANSFER_UUID>
[INF] End GetSALCommandRenewConnectionObject
[DBG] [Response]: {
  "error": {
   "message": "entry doesn't exist",
   "code": "4",
   "target": "uuid"
  }
}

[ERR] ErrorCode (-1), ErrorMessage (Snapmirror update failed with SDError (102) - SnapMirror update operation failed.
Failed to update the SnapMirror relationship.
Object reference not set to an instance of an object.

Please check the Windows event log and SnapDrive logs for more details.Snapmirror update failed with SDError (102) - SnapMirror update operation failed.
Failed to update the SnapMirror relationship.
Object reference not set to an instance of an object.

• May also see the following error message where SCV cannot find the relationships:

2025-11-25 05:00:46.365 +01:00 [INF] Command: Get-NcSnapmirror Force ZAPI: false
2025-11-25 05:00:46.365 +01:00 [DBG] Running Command Get-NcSnapmirror controller name : 192.168.169.174, vserver : 
2025-11-25 05:00:46.366 +01:00 [INF] Is REST supported for the command: True
2025-11-25 05:01:00.362 +01:00 [ERR] Record doesn't exist
 Record doesn't exist
2025-11-25 05:01:00.362 +01:00 [DBG] [Response]: {
  "records": [
  ],
  "num_records": 0,
  "_links": {
    "self": {
      "href": "/api/snapmirror/relationships?query=*%3aDAV4_HA_vm%7cDAV4_HA_vm&query_fields=source.path%2csource.consistency_group_volumes.name&fields=uuid,source.path,source.svm,destination.path,destination.svm,policy.uuid,policy.name,state,transfer,healthy,exported_snapshot,destination.consistency_group_volumes.name,source.consistency_group_volumes.name,destination.cluster.name,destination.svm.name,destination.svm.uuid,policy.type,source.cluster.name,source.svm.name,source.svm.uuid,restore,group_type,_links&state=!null"
    }
  }
}
2025-11-25 05:01:00.362 +01:00 [ERR] API exception: System.ArgumentException: Record doesn't exist