Group 1 - The article discusses various scenarios related to issues encountered when issuing electronic invoices, particularly focusing on QR code problems and their solutions [2] - It highlights the importance of using the correct version of the tax app to avoid errors during the QR code scanning process [2] - The article provides troubleshooting steps for different situations, such as checking the clarity of the QR code and ensuring the correct app is used for scanning [2] Group 2 - The content emphasizes the need for users to ensure their devices are properly connected to the internet when facing QR code issues [2] - It mentions that if the QR code is valid but still not working, users should consider restarting their devices as a potential solution [2] - The article also notes that the choice of app for scanning the QR code must match the app used to generate it, to avoid recognition errors [2]