A user will find that if they create a sandbox from an org with the transaction maintenance job, the sandbox will miss this job.

Why is the Transaction Maintenance job missing from my sandboxes?

This is due to a known platform limitation. Follow the steps below to create the missing Apex job in the new sandbox:

1. Open the Developer Console:
    a. Click the Gear Icon in Salesforce header.
    b. Click Developer Console menu item.

2. Within Developer Console window:
    a. Navigate and open Debug menu item.
    b. Click on Open Execute Anonymous Window menu item.

    c. Within the editor that is open, clear the existing content (if there is any), and enter the following code:
    new advpm.PostInstallHandler().onInstall(null);

    d. Click Execute button.