Thanks for adding this and have an awesome holiday!
For self-testing, I created a newsletter and sent to my personal email where I opened it but still showing 0 email opens.
My Mailgun is configured to allow email tracking. Not sure if I’m missing anything else 
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Happy holidays to you all and thank you for the ongoing support.
Also the ‘unsubscribe’ and ‘view online’ links don’t seem to be working for me.