Service logs are approved or rejected by the administrator(s) of the organization you are affiliated with. If your service log was rejected, first check to see if there is an attached comment explaining why it was not accepted. If there is no comment, reach out to your administrator(s) for further clarification/next steps.
Each administrator can choose their own criteria for approving a service log, and if they choose to reject a log they can also supply a specific reason. Whenever a log is rejected you will get an email notification. To re-submit the log, you can go to the Activity tab, select the specific Activity from the list, click "Edit", make your changes and then "Update Hours".