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As the title suggests, I am doing a SharePoint Provider-hosted app that will be deployed to Microsoft Azure. I implemented security with custom Authentication class which references Owin namespaces.

One of our requirements were two authentication methods:

  1. a custom forms-based one
  2. a user-identifier is read from CSOM context and if that identifier exists in my custom accounts table, the user is also logged in.

I decided to use Microsoft.SharePoint.Client.User.LoginName as my identifier but I don't know if this will be unique/secure? What if the user changes his/her email address? Will it reflect in this property?

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