AspNetCore.Docs/aspnetcore/includes/chain-auth-providers.md

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When the app requires multiple providers, chain the provider extension methods behind AddAuthentication:

services.AddAuthentication()
    .AddMicrosoftAccount(microsoftOptions => { ... })
    .AddGoogle(googleOptions => { ... })
    .AddTwitter(twitterOptions => { ... })
    .AddFacebook(facebookOptions => { ... });