This error can mean the activation code was used, expired or cannot currently be accepted. It does not prove that your plan was successfully installed or used.
Check for an existing profile
Look in your phone's SIM settings. The line may have a carrier name or a generic label instead of SimFuse. Compare its ICCID with the app if possible.
If it is already installed, do not keep scanning. Follow "My eSIM is not working: start here".
If you used another phone or deleted the profile
Tell support what happened. Many travel eSIM codes cannot install a second profile, and deleting one does not reset its code. Transfer or replacement needs checking for the specific eSIM.
Ask support to check
Send the order reference, exact error and whether any device completed installation. We can check the available recovery options before you buy again. Keep the profile if it is still present, and do not post its QR code or activation details publicly.