AWS Backup not creating backups with AWS Organizations

I’m trying to set up AWS Backup with AWS Organizations and I’m having trouble getting the backups to be created. Here are the steps I’ve taken:

In AWS Organizations, I went to policies and enabled backup policies.

I created a backup policy with the following JSON:

{
  "plans": {
    "main-backup-plan-eu-central-1": {
      "regions": {
        "@@assign": [
          "eu-central-1"
        ]
      },
      "rules": {
        "main-backup-vault-eu-central-1": {
          "schedule_expression": {
            "@@assign": "cron(6 20/1 ? * * *)"
          },
          "start_backup_window_minutes": {
            "@@assign": "60"
          },
          "complete_backup_window_minutes": {
            "@@assign": "120"
          },
          "lifecycle": {
            "delete_after_days": {
              "@@assign": "14"
            }
          },
          "target_backup_vault_name": {
            "@@assign": "backup-vault"
          }
        }
      },
      "selections": {
        "tags": {
          "backup-assignment": {
            "iam_role_arn": {
              "@@assign": "arn:aws:iam::$account:role/cross-account-backup-role"
            },
            "tag_key": {
              "@@assign": "bkp_schedule"
            },
            "tag_value": {
              "@@assign": [
                "hourly"
              ]
            }
          }
        }
      }
    }
  }
}

I set the target to my AWS dev account.

In the dev account, I created a backup vault and an IAM role named cross-account-backup-role with the AWSBackupServiceRolePolicyForBackup and AWSBackupServiceRolePolicyForRestores policies attached.

Then i added the tag to an EC2.

Despite these steps, the backup plan is running but no backups are being created. The resources I want to back up have the bkp_schedule tag with the value hourly.

Does anyone know what might be causing this issue or how I can troubleshoot it further?

The problem was because of vault name. The name in the account was backup_vault instead of backup-vault.