using System.Collections.Generic;
public static void Main()
Console.WriteLine("Hello World");
List<string> KnownAuthenticationErrors = new List<string>
var errorMsg="contains error: 'invalid_grant', error_description: 'AADB2C90090: The specified kid 'Atr3vKL53_F8HNXgDjYGROG0d6etyWOk7vV-Ok0dkYk' is not found for JWE.";
var isKnownError = KnownAuthenticationErrors.Any(error => errorMsg.Contains(error, StringComparison.OrdinalIgnoreCase) == true)
|| KnownAuthenticationErrors.Any(error => errorMsg.Contains(error, StringComparison.OrdinalIgnoreCase) == true);
Console.WriteLine($"IsKnown {isKnownError}");