EID Missing on iPhone 12 Pro max

I got my new iPhone 12 Pro Max a little over one month today and went to get an eSIM. Then I was told by the cellular carrier that my device does not support eSIM.

They confirmed that my phone has only MEID. I also checked my Mobile Service in settings and didn’t find the “Add eSIM “ option.

Kindly assist cos I don’t know what to do.