Xamarin iOS Push notifications do not work in Production but work fine in Development

will help you So I'm not 100% sure what the problem was but I've fixed it. I ended up removing anything that had to do with skus then slowly adding it back in bit by bit.
What I think most likely caused the issue was that I had a version of a the Product class that I renamed because I wasn't using it and didn't want to lose track of the work that I had done (I know, not necessary as I'm using git. I guess old habits die hard) Anyway, I had changed the file name, however I neglected to rename the class definition in the file. The name was such that it came after the real Product class that I was using. I'm thinking that this caused a conflict on heroku. The thing I don't understand is why it didn't cause any problems in my local dev environment.

To fix the issue you can do Create a provisioning profile for "Ad Hoc" distribution, using your production certificate. Sign your app with that and install. Make sure your SSL connection to APNS knows which certificate to use, depending on whether client is production or dev.

seems to work fine The main reason production pushes don't work while dev ones do is you have broken the

a) Prod app - Prod gateway - Prod certificate
b) Dev app - Dev gateway - Dev certificate

ssl://gateway.push.apple.com:2195

ssl://gateway.sandbox.push.apple.com:2195

To fix this issue You can test your production mode notifications before releasing it to appstore. Apple provides a mechanism for it. You need to build an AdHoc version of your App. If you are not familiar with Adhoc distribution please refer the below link
iPhone: Push Notification Testing on Production Certificate