Hi Vanessa - Welcome to the Atlassian Community!
In Jira Cloud, you cannot make a field mandatory based on the value of another field or linkage. You could make it mandatory as you transition an issue from one status to another using a third party add-on such as JMWE or ScriptRunner.
Hi! My name is Eoin and I'm a product manager working on Team-managed projects in Jira Software Cloud. We're continuously improving and updating Jira Software and feedback from our customers is ...
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