After getting our Jira admin to setup X-Ray for Jira - there is problem, when I create a X-Ray "Test". In the "Test Details" section, we get this error message: " view-issue-section.error.custom-fields-not-configured.title" "view-issue-section.error.custom-fields-not-configured.message" (see also attached image) I hope someone here might have had a similar experience and know what to check.
Xray presents that error message when its needed Jira custom fields aren't setup.
The vendor has a knowledge base article that addresses this: https://confluence.xpand-it.com/display/ProductKB/%5BXray+Server%5D+Xray+Custom+Fields+Not+Configured
Hope this helps!