"Work category" field is null.

[中村]

When I use Mail Handlers or use Automation in Jira Service Mangement to automatically create issues, their "work category" field is always empty.
This makes it difficult for me to find the created issue in categories such as incident,problem,and change in the sidebar. Can only be found in the View all issues section of Filters.
And when I tried to edit this field, I found it to be non editable.
What should I do to assign a value to the "work category" field so that these automatically created issues can be found in the sidebar category, just like the manually created values.

Please help me solve my problem, thanks.