If your Jira integration is not working, check the following:
Custom fields are created (see 1. Creating custom fields in Jira) and a custom Request Type is created (see 3. Creating a custom Request Type). In particular, make sure the Request form tab is selected when adding your custom fields and the Description field is also added.
The integration with ABR completes successfully (see 4. Integrating Jira with Admin By Request). Make sure you use the correct email address as your Jira username and you have at least one service desk instance available.
If you plan to extend the integration with Jira automation rules, don't forget the Jira audit log that is available with each rule (see Creating Jira automation rules).