Welcome to the community, @jayjay! Please note that you do not get a QR code for the project itself. You only get it for the accounts settings. To learn more about the same, please feel free to go through the support article that has been linked in the post (earlier). If you still however wish to create a QR for the project, you could do it as oultined in the post discussed previously:
But please note that this workaround is meant for collecting data through Enketo aka web forms.
