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ServiceNow.Core 
SNow.Core.Authentication.Authenticator 
Authenticator.AuthenticateAsync(AuthenticationConfig, ITokenAcquisition) Method 
Authenticate in to AAD based the configuration provided
csharp
public static System.Threading.Tasks.Task<Microsoft.Identity.Client.AuthenticationResult> AuthenticateAsync(SNow.Core.Authentication.AuthenticationConfig configuration, Microsoft.Identity.Web.ITokenAcquisition _tokenAcquisition=null);Parameters 
configuration AuthenticationConfig
_tokenAcquisition Microsoft.Identity.Web.ITokenAcquisition
Returns 
System.Threading.Tasks.Task<Microsoft.Identity.Client.AuthenticationResult>