If you're having issues while connecting Excel to your Sage 50 software. This error occurs when you send data or a report to Excel from Sage 50 Accounts. The error causes you're not running Sage 50 as an administrator, not using a compatible version of MS Excel, and an issue with the installation of MS Office. You need to run Sage 50 with admin rights, and check MS office is compatible with your version. In the meantime, please try connecting to Excel using another method https://www.askforaccounting.com/sage-50-failed-to-connect-to-excel/