Before anything else, check permissions. Validate whether the user you are using as the reporter of the new issue actually has create issue permission in the project you want the issues to be created.
And next, check whether the configuration of your project allows for issues to be create based on what you want to include in the issue (mainly check issue types and custom fields):
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Hi Atlassian Community! My name is Shana, and I’m on the Jira Software team. One of the many reasons this Community exists is to connect you to others on similar product journeys or with comparabl...
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