Hi in my xamarin project am getting this issues when I try to open the azure web apps from visual studio 2015. 
why this is coming I tried to add the subscription from the visual studio but doesn't work any can guide me on this
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According to your description, I assumed this is the IDE issue. Based on my understanding, you could try to install Microsoft Azure SDK for .NET (VS 2015) -3.0 which is released at 3/7/2017, then find out whether this upgrade could help you to solve this issue. Here is the release download, you could refer to it.