score:3

Accepted answer
{ Object.keys(tickets.issues).map((issue, i) => (
  Object.keys(issue.fields).map(field=>(
 <li key={field.key}>
   Issue number: { field.key }
 </li>
)
))}

score:1

  <div>
    <ul>
      {tickets && tickets.issues && Object.keys(tickets.issues).map((issue, i) => 
     (
      <li key={i}>
         Issue number: {tickets.issues.key}
      </li>
    ))}
    </ul>
  </div>

score:2

const { issues } = tickets;
issues.map(issue => console.log(issue.key));

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