in src/Amazon.AspNetCore.Identity.Cognito/CognitoUserManager.cs [597:606]
public override async Task<IdentityResult> SetPhoneNumberAsync(TUser user, string phoneNumber)
{
ThrowIfDisposed();
if (user == null)
{
throw new ArgumentNullException(nameof(user));
}
await _userStore.SetPhoneNumberAsync(user, phoneNumber, CancellationToken).ConfigureAwait(false);
return await UpdateUserAsync(user).ConfigureAwait(false);
}