Instagram oauth api gives {"error_message": "The match code was not found or has already been used.", "Code": 400, "error_type": "OAuthException"}

Question

I see this error on my real server using the Instagram API.

{ "error_message": "Matching code was not found or was already used." , "code": 400 , "error_type": "OAuthException" } 

I read a few suggestions here to clear the cache, but this does not fix the problem. I also can’t send a support ticket directly to Instagram, as I get an error message when I try to send a ticket.