ios - Why won't openSystemURL on watchOS2 won't open tel: urls -

i trying dial number in watchos 2 application using opensystemurl tel: url method:

let extent = wkextension.sharedextension() extent.opensystemurl(nsurl(string: "tel:1-408-555-1212")!) 

this not anything, when use sms: url works should if send sms message.

it explicitly says in documentation opening tel: urls possible. doing wrong?

this api working in watchos 2 beta 5