but in dash board it says #404 what to do…
You are using an incorrect module of facebook. You need to use facebook module legacy version in your scenario.
Click on the + sign on the right bottom section of the scenario and type facebook in the search bar.
upon selecting facebook it will either show you option of selecting latest or legacy module or legacy module on its own if latest module is currently getting used in the scenario.
You should be able to get create a post option. If you still face issue, then please revert back with the new error message that you get.
Sir I did what you said before so I deleted it and create all new I created webhooks and add Facebook legacy and selected create post option and pasted the link of webhooks this is what I did is there any mistake please say