A message came to the mailbox, but there is nothing in the Drafts folder? Go through the causes in this order — the most common are at the top.
1. The assistant is in trial mode
In trial mode drafts are made only in draften; they do not go to the mail. You can tell by the trial mode label at the top of every page. The drafts are in the Drafts section. How to go live is shown in Trial mode and going live.
2. The mail check has not run yet
The assistant looks into the mailbox at regular intervals (usually every 5 minutes). At the bottom of the Overview you see when it last checked the mail. Want it now? Click the round-arrow button at the top right — Check the mail.
3. The assistant is switched off or the mailbox paused
A switched-off assistant reads no mail. The top of the page then shows a Start the assistant button. A paused mailbox is resumed by an organisation manager.
4. The mailbox is disconnected
When the mailbox loses access to the mail (a changed password, a withdrawn consent), the assistant skips it. Settings → Mailbox and access then shows disconnected. Connect it again and run the connection test — see Mailbox and access.
5. The message was not meant to get a draft
Open Mail and find the message. Its status and reason say why: automatic, skipped by the Filter, no reply. Every status is explained in Why some mail gets no draft. Ask for a draft with Draft a reply.
6. A limit or the cost cap was reached
The message has the limit status, and the Overview warns about the cap. The assistant continues the next day; the limits are in Settings → Behaviour and limits.
7. A draft was written but not created
The rejected status means the draft failed a check. See The draft was not created.
8. You do not see the message in Mail at all
Then the assistant skipped it on purpose: it came from your own address, to another assistant's alias, or already carries the assistant's label. Or it arrived before the assistant started (the first check covers only the last 24 hours).
None of these?
Look at Settings → Activity, at the last mail checks and events. If there is an error, send it to your organisation's manager.