in src/Amazon.AspNetCore.Identity.Cognito/CognitoUserManager.cs [707:721]
public override async Task<IdentityResult> AddClaimsAsync(TUser user, IEnumerable<Claim> claims)
{
ThrowIfDisposed();
if (user == null)
{
throw new ArgumentNullException(nameof(user));
}
if (claims == null)
{
throw new ArgumentNullException(nameof(claims));
}
await _userStore.AddClaimsAsync(user, claims, CancellationToken).ConfigureAwait(false);
return IdentityResult.Success;
}