How to find the Device ID for an iPhone XR?

I am trying to add an iPhone XR (iphone11,8) to the developer portal and the phone will not give up it's device UUID. iTunes cycles through Serial Number, ECID, and Model Ident. System Info appears to display the UUID as "Serial Number" for other devices, but for the XR the displayed string is too short and the last half of it appears to be the ECID. What to do next?


Mac OS 10.14, iOS 12.1, iTunes 12.9.0.164, Xcode 10.1 (10B61)

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