If you need to find issue entity properties for support purposes, please make the following Jira API REST call:
curl --request GET \
--url 'https://your-domain.atlassian.net/rest/api/2/issue/{issueIdOrKey}?properties=*all' \
--user 'email@example.com:<api_token>' \
--header 'Accept: application/json'
The above request uses curl command.
You can also make the request through a tool like Postman app or similar.