Make a call with callkit? It's not dialing.

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Swift

Based on various sources, I have implemented CallKit like below, but my app is not dialing. Any ideas? No errors are being reported, my phone has wifi calling enabled, and my provider supports it.

What I have tried:

Here is what I have:

let provider = CXProvider(configuration: CXProviderConfiguration(localizedName: "My App"))
provider.setDelegate(self, queue: nil)
let controller = CXCallController()
let transaction = CXTransaction(action: CXStartCallAction(call: UUID(), handle: CXHandle(type: .phoneNumber, value: "5555555555")))
self.controller.request(self.transaction, completion: { error in
    if(error != nil){
        print(error)
    }

My Extension:

extension ViewController : CXProviderDelegate {
    
   func providerDidReset(_ provider: CXProvider) {
        }
    
   
    
   func provider(_ provider: CXProvider, perform action: CXAnswerCallAction) {
            action.fulfill()
        }
    
    func provider(_ provider: CXProvider, perform action: CXEndCallAction) {
            action.fulfill()
        }
    
}