After adding Microsoft, I added Twitter authentication. It, however, wouldn't build because it was missing this package: Microsoft.AspNetCore.DataProtection.Abstractions
After adding that to the project it worked. I'm not sure why this isn't added automatically or at least documented above stating if you have more than one to add this.
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@wadepickett confirm and fix.
@aspnerd, thanks for writing up the issue! What version of the .NET Core SDK were you working with as you went through this tutorial?
Shiny new 3.1