<PackageReference Include="Microsoft.IdentityModel.Tokens" Version="8.19.0" />

Microsoft.IdentityModel.Tokens.Experimental.IssuerValidationDelegateAsync

Definition for delegate that will validate the issuer value in a token.
namespace Microsoft.IdentityModel.Tokens.Experimental { [return: System.Runtime.CompilerServices.Nullable(new byte[] { 1, 0, 1 })] public delegate Task<ValidationResult<ValidatedIssuer, ValidationError>> IssuerValidationDelegateAsync (string issuer, SecurityToken securityToken, ValidationParameters validationParameters, CallContext callContext, CancellationToken cancellationToken); }