Depending on your type of chatflow, you can follow our instructions below to test your flows on Messenger.
Welcome Message type:
Make sure that your personal test account doesn't have any conversation with your Facebook Business Page. If there is an existing conversation, please delete it. This, in general, allows you to get into the Welcome Message flow that is only sent to new users.
Make sure that the bot is activated (check the Active/Inactive toggle).
Click on See It Live button that sends you to a Messenger window to start the conversation with your Facebook Business Page.
Repeat step 1 to 3 if you make any changes in the flow and want to test it again.