I have published my Facebook app (related to messaging) and it was confirmed, however, users cannot find it in Facebook's search bar and in apps category. Is there anything I am missing? I tried to search for the solution in Facebook's documentations and etc, but did not succeed. Thank You in advance.
Messenger bots/apps don't show up in the search, but the Facebook Page you linked your app to. For Messenger bots and businesses there's the Discover section in the Messenger app itself.