A snafu due to glitch in options of the app can be a factor that may lead to Unblock My Marketplace On Facebook account account failure. Therefore, to resolve this issue you can use the assistance that is provided by the tech support team and get the problem resolved. If you don’t want the above approach, then you can watch some tech vids. https://www.7qasearch.net/blog/unblock-my-marketplace-on-facebook/
To see this working, head to your live site.