This App couldn't be loaded due to an issue with browser cookies

MarcoMonteiro
Tourist
5 0 2

I created a shopify app with React/Node using the instructions here: https://shopify.dev/apps/getting-started/create 

Next I deployed the app with Heroku and tried to install it in my test store. When I try to open the app I get the following error: "The app couldn’t be loaded. This app can’t load due to an issue with browser cookies." I also the following screen flash briefly: 

Screen Shot 2021-08-14 at 5.20.07 PM.png

I've already tried all the suggestions in this post: https://community.shopify.com/c/Shopify-Apps/The-app-couldn-t-be-loaded-on-my-shopify-store/td-p/712.... (Switch browsers,  enable cookies, clear the. browser cache). The app worked when I hosted via Ngrok but not with Heroku. Do you have any suggestions?

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