The delete action is shown only for your own message, while it remains within the 30-minute deletion window and has not already been deleted.
Check the sender and timestamp before treating a missing action as a display problem. A reply from the Institution Team is not your message to delete, and an older message does not become eligible again when you reopen the thread.
If you need to correct an older message, add a follow-up that quotes or identifies the incorrect detail and supplies the replacement. If the problem involves sensitive information, contact support with the thread context and explain the issue without copying the sensitive value again.
Do not change your device clock or use another account to try to regain deletion. The workspace enforces the action on the message record. If the control is present but the request fails, keep the error wording and check whether the original content is still visible. A hidden menu and a failed deletion are different situations for support to investigate.
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