There is another way that you can check the EID number.
If you go to the dial pad and dial "*#06#", then a page of bar code will come up.
If you can not find the EID number, then this means your phone does not support eSIM, and you will not be able to use the eSIM with any company.
In this case, please kindly contact us as soon as possible at "contact@sakuramobile.jp".