Hi ​@User name Ethan the iPhone 7 is not eligible for an eSIM transfer. You can only use the eSIM Quick Transfer from an Apple iPhone 11 or newer, SE 3 or newer on iOS 16.4 or higher. 

If you’re tying to convert your physical SIM to an eSIM you can only do this if this physical SIM was not converted into an eSIM before, as conversion can only be performed once per physical SIM.

You can find more information on eSIMs here https://www.koodomobile.com/en/help/esim-and-esim-vouchers