Your next.js might have issues accessing your env file (also I would suggest not pushing that on your public repo in case you have some sensitive information there, luckily the Storefront API is readonly).
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Could you push your code to github so I can take a look?
github.com/fernandodomain/Headless...
Shows a 404, maybe it a private repo?
Sorry. Made it public
Try to add a next.config.js file to the root directory like this: github.com/iskurbanov/shopify-next...
Your next.js might have issues accessing your env file (also I would suggest not pushing that on your public repo in case you have some sensitive information there, luckily the Storefront API is readonly).