CompletableCallback Listener dons't work

[mwaked]

Hello, I am trying to request permission and listen to complete() or error(e: VpnException) but callbacks don't work when granted or denied VpnPermissions.

                if(VpnPermissions.granted()){
                        Log.d(TAG, "VpnPermissions.granted() == true")
                }else {
                    Log.d(TAG, "VpnPermissions.request...")
                    VpnPermissions.request(object : CompletableCallback {
                        override fun complete() {
                            Log.d(TAG, "complete()")
                        }
                        override fun error(e: VpnException) {
                            Log.d(TAG, "Error: $e")
                        }
                    })
                }