Live automations
Create a Send Link To Me live automation. Set a 2-hour window by default, a keyword or every comment, and the Direct reply.
Match comments during a live window and send the private reply in Direct. Live rules are account-wide. They are not tied to one live session.
Create a live rule
Title: Live auto-reply. Lede: Set a name, optional active times, then the keyword and DM for live comments.
Default window: now to now plus 2 hours.
During the live
Matching live comments in the window trigger the DM within Meta caps. After Active to, the automation shows as Ended.
Switch it Off anytime from the automation page if you need to stop sends early. See Turn off or delete.
Keyword overlap
Live keyword overlap is account-wide across all live comment automations, not scoped to one window. If two live rules share a keyword, create fails with Keyword "…" is already used by another automation on this post. The wording says this post even on live. Turn on Send DM to all comments to skip the overlap check (that switch means every comment, so keywords are not compared).
Related
Story automations
Create a Send Link To Me story automation. Listen to replies in a 24-hour window, or attach the rule to one live story.
DM keywords
Reply automatically when someone sends you a keyword in Direct, when they share your post or Reel to your DMs, or when they tap an Ice Breaker or the menu. Every plan.