Thanks for confirming! Including the same test case multiple times in the same test run wouldn’t be supported currently. We would recommend creating a test plan and adding multiple runs to the plan that contain the same test case. You can also look into using TestRail’s test plan configurations to manage this if you are adding multiple test cases to the same test plan for use with various platform configurations (e.g. such as browser, operating system, device, etc. combinations):
Hope this helps!