Possible Causes
Have you created a different issue type to use it as a Requirement, but you can not see why it is not taking this behavior?
CorrectÂ
Not correct
Solution
You need to configure your issue type as a Requirement in the Xray settings:
1 - Go to Jira Administration
2 - Go to Manage apps
3 - Go to Xray
4 - Go to Issue Type Mapping
5 - Drag and drop your issue type from the "Available Issue Types" box to the "Requirement Issue Types" box
6 - Save
Link for related documentation
Issue Type Mapping Documentation link