<PackageReference Include="Microsoft.Identity.Client" Version="4.87.1-preview.1" />

Microsoft.Identity.Client.MsalClaimsChallengeException

This exception indicates that claims have been returned from the endpoint that need to be resolved. This can be achieved by using them in the next authentication request. See Conditional Access and claims challenges. See Handling multifactor auth (MFA), Conditional Access, and incremental consent.
namespace Microsoft.Identity.Client { public class MsalClaimsChallengeException : MsalUiRequiredException { public MsalClaimsChallengeException(string errorCode, string errorMessage); public MsalClaimsChallengeException(string errorCode, string errorMessage, Exception innerException); public MsalClaimsChallengeException(string errorCode, string errorMessage, Exception innerException, UiRequiredExceptionClassification classification); } }