If your app is fully approved & getting this error message during enabling Bot Connection 
Remove the app from here  https://www.facebook.com/settings?tab=business_tools 
 
 Then Import account by Login With Facebook again.
 
Now check again, it should solve the issue.
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1 Answers
khbmedia
5 years agothank you
xeroneitbd Admin
5 years agoWelcome.