Why can't I set my ticket to solved?

<h2 id="h_01HZQ2WYRXJGGTPYTYB0QH28ZH">Question</h2><p>Why can't I change my ticket status to solved? I need to solve the customer ticket, but one of the following error messages appears:</p><ul>
<li data-list-item-id="e71c088671a8d5e26eb74536a3f382a6b">
<strong>"Ticket field name" needed</strong><br><img class="wysiwyg-image-resized" style="aspect-ratio: 718/422; width: 25%;" src="https://support.zendesk.com/hc/article_attachments/11005174691610" alt="Ticket field name needed" width="718" height="422">
</li>
<li data-list-item-id="e03149c7c95b794bd3229c194021d0282">
<strong>Assignee is required when solving a ticket</strong><br><img class="wysiwyg-image-resized" style="aspect-ratio: 726/406; width: 25%;" src="https://support.zendesk.com/hc/article_attachments/11005174691866" alt="Assignee is required to solve a ticket" width="726" height="406">
</li>
</ul><h2 id="h_01KXDDJBDR342N3Y3FB3CR6WTE">Answer</h2><p>You can't solve a ticket unless the ticket has:</p><ol>
<li data-list-item-id="ee53adc6895b65aa03d8f5fda81bd39bb">An <strong>Assignee</strong>
</li>
<li data-list-item-id="e8799acee1ba025b864a7dddb995a3bed">All mandatory fields contain a value</li>
</ol><p>To solve this behavior:</p><ol>
<li data-list-item-id="ebaf703cff2534aa5cff95a75bf5142ec">Refresh the page</li>
<li data-list-item-id="e29009e3906a9eb77ad19017d167cb2eb">Verify these two elements</li>
<li data-list-item-id="ecfe6c19737a355c026b6322c9717bd42">Try again</li>
</ol><div class="p"><div class="note">
<span class="notetitle"><strong>Note</strong>:</span> The error message lengthens if more required fields are left blank.</div></div><p>For a similar issue, see: <a href="https://support.zendesk.com/hc/en-us/articles/7529092197530-The-Solved-button-is-grayed-out-on-my-messaging-ticket" target="_blank" rel="noopener noreferrer">The Solved button is grayed out on my messaging ticket</a>.</p><style>
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<h2 id="h_01KXDDSKEPERQCV5KAY8M3SQKD">Why can't I set my ticket to solved? Why can't I change my ticket status to solved? Why can't I solve the customer ticket? Why does the error message "Assignee is required when solving a ticket" appear?</h2>
<p>You cannot solve a ticket unless the ticket has an **Assignee** or agent or support person or team member, and all mandatory fields or data boxes contain a value. To solve this issue, refresh the page, verify these two elements, and try again. The error message or "Ticket field name" needed message lengthens if more required fields remain blank.</p>
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