Session was not valid after deploying to heroku - embedded app

[geobertz]

I have been trying to figure this out for hours and I really cant solve it.
I previously had this issue with our first app I was able to fix it by setting the correct scopes in shopify.js
But now I had this problem again, the only difference now is im using extension to enable our app instead of script-tags.

I development version of this app is working perfectly fine, but when i created a production version of this app, upload files to heroku, then update the production app URL and I tried to install it on a development store, I keep being redirected 3 times, and when I check the log it keeps saying SESSION WAS NOT VALID.

Please help me, I really need to be able to deploy this on production. Thank you