How to implement an eSim on iPhone?

Question

I need to install the eSim from the app automatically. I added this code:

let ctpr = CTCellularPlanProvisioningRequest()
let ctcp =  CTCellularPlanProvisioning()

But when I call this next code:

ctcp.addPlan(with: ctpr)

I get this case. unknown the result is: .unknown case It's always returns 'unknown'.

I also sent a request on Apple eSim entitlements a long time ago. But they didn't respond.