UnityAds not working on iPad Pro

I am testing the same game build against different physical iOS devices.
Everything works great, except on the iPad Pro.
UnityAds consistently fails to be "Ready" on the iPad Pro 12.9 inch 4th Gen (WiFi) [aka iPad8,11]

Looking at the runtime logs, it appears to be failing at the ad auction step.

iPhone8 Request [works fine]:

Code (HTML):

1. Requesting ad plan from https://auction.unityads.unity3d.com/v6/games/XXXXXXX/requests?advertisingTrackingId=481C7103-XXXX-XXXX-XXXX-2A1C8D600807&limitAdTracking=false&deviceModel=iPhone8%2C1&platform=ios&sdkVersion=3420&stores=apple&osVersion=13.3.1&screenScale=2&screenWidth=375&screenHeight=667&connectionType=wifi&networkType=0\
2. UnityEngine.Advertisements.Platform.<>c__DisplayClass38_0:<UnityAdsReady>b__0()\

iPad Pro Request [never succeeds]:

Code (HTML):

1. Requesting ad plan from https://auction.unityads.unity3d.com/v6/games/XXXXXXX/requests?advertisingTrackingId=11FE5E40-XXXX-XXXX-XXXX-9570F3D91950&limitAdTracking=false&deviceModel=iPad8%2C11&platform=ios&sdkVersion=3420&stores=apple&osVersion=13.4.1&screenScale=2&screenWidth=1024&screenHeight=1366&connectionType=wifi&networkType=0\
2. Unity Ads show failed: Placement "LevelCompleteAd" is not ready\

Can anyone confirm that UnityAds are indeed working on iPad8,11 deviceTypes?