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The title should really say it all:

  • Web Application with both Windows (NTLM) and FBA
  • CSOM and REST requests are both failing with 403 (Forbidden)
  • ClientContext.AuthenticationMode set to "Default" (there is no "force windows auth" option)

  • SPClaimsAuthRoleProvider is the default provider in IIS

If I remove FBA then all my API calls start working. Any ideas?

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