When user trying to add the testcase to the Test Cycle facing the below issues:
* While adding from view issue page getting the error "error creating execution, please correct input and try again."
* While adding from Plan Test Cycle page getting the error "You do not have permission to see the issue"
*Created testcase has the issue security level but to which 'Single user (Zephyr for JIRA Cloud)' user has not been added.
*Add the 'Single user (Zephyr for JIRA Cloud)' user to your issue security level as shown in the below screenshot. (Select your project-> Administration->Issue security->Actions->Edit Issue security).
* Perform JIRA re-indexing then Zephyr for JIRA Cloud re-indexing. And clear the server cache.
* Now add the testcase to Test Cycle from both view issue page and Plan Testcycle page. You should not get the error.
Product : Zephyr for JIRA Cloud
Version : ALL