Why eSIM QR code can’t be installed?

1. Please check your eSIM Mobile is an unlocked version
2.Please check if eSIM QR code expires or not.
3.Please confirm the eSIM QR has already been scanned by other Mobiles
4.Once QR code generated, it has to be activated within 30days, 90 or 180days according to related eSIM data bundle QR validity.