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This means the app does detect that you have the Metamask extension on your browser, but that you haven't connected to any address with it. The "User denied web3 access" is displayed in the console when that is the case.

I have updated to tutorial (and repo) so that the error is explicitly displayed on the page as well.

Thank you for your question! Don't hesitate if you have any other!

I've added a pull request that makes the app more intuitive by automatically asking for connecting the address.

Lars K.L. It's edited! Thank you so much!