The Mixed Reality Forums here are no longer being used or maintained.
There are a few other places we would like to direct you to for support, both from Microsoft and from the community.
The first way we want to connect with you is our mixed reality developer program, which you can sign up for at https://aka.ms/IWantMR.
For technical questions, please use Stack Overflow, and tag your questions using either hololens or windows-mixed-reality.
If you want to join in discussions, please do so in the HoloDevelopers Slack, which you can join by going to https://aka.ms/holodevelopers, or in our Microsoft Tech Communities forums at https://techcommunity.microsoft.com/t5/mixed-reality/ct-p/MicrosoftMixedReality.
And always feel free to hit us up on Twitter @MxdRealityDev.
Do we still build to Windows Store in Unity 2017.2.0b6?
Windows Store is not available in the list of platforms in Unity 2017.2 beta... UWP is there and it will build and run while debugging--under certain conditions it will launch in the mixed reality portal as well.
Have installed/uninstalled--I've tried b5 as well with the same results.
Select File > Build Settings...
Select Windows Store in the Platform list and click Switch Platform