Connecting Heroku App to Atlas MongoDB Cloud service

Question

To antecipate the question: do I need to get SSL support on Heroku in order to establish a connection between Heroku and Atlas Mong

Answer 1

Also had to add 0.0.0.0/0 to the Mongo IP whitelist AND redeploy my app on Heroku for it to finally work (before changing IP, a CORS error was thrown).