This error appears when an eSIM is already installed on a device, or it has been partially installed.
Often, an install will finish successfully even if you see this error. So, check your settings to see if the eSIM is already installed.
If there is an issue with the install, the partially installed eSIM should show in your settings. In this case, delete the partial eSIM, then rescan the QR code to start a fresh installation.
If you would like help determining whether your eSIM has installed successfully, try asking our chat bot, SIMon.