You can’t buy or sell on Facebook Marketplace if your app icon is missing. Here’s what’s likely happening and what you can do to get it back.
Here is a list of possible reasons why your Facebook account does not have the Marketplace option:
Follow these tips to see if you can get the Marketplace icon back on your Facebook account:
Visit Facebook Marketplace directly. By using Marketplace in a web browser, you confirm that you have access to the service, even if the app doesn't work for you.