I can't reply to a specific message or conversation in Messenger.

Some things you can try:

If it still doesn't work, reasons why include:
  • The person you’re trying to message deactivated or deleted their account.
  • You've blocked the person you're trying to message or they’ve blocked you.
  • You’re trying to respond to a group conversation that the other members of the conversation have already left.

You can also learn how to:
If you can't send messages to anyone or are seeing a different error, learn more about fixing problems on Messenger or how to make sure your Messenger app works properly.