Verification Check Failed - Requested Resource Not Found (Intermittent Failure)

[periapsistech]

Issue Summary

This has been reported (and fixed?) on the twilio-node project, however I am experiencing this same issue using v5.52.1 with C# ASP.NET Core 3.1. It appears to be intermittent as only a small percentage of the user base has seen this issue. What's interesting is when it does fail, it will continue to fail 3 total times before working again. During the failures for some users, others continue to complete verification check as expected.

Steps to Reproduce

1. Server sends user SMS Verification Check code using Twilio API
2. User enters code in UI and submits to server for Verification Check
3. Server utilizes simple Verification Check to verify
4. Random failure reported below occurs, estimating <5% failure rate

Code Snippet

public async Task<bool> CheckVerification(string toNumber, string code)
{
    try
    {
        TwilioClient.Init(_accountSid, _authToken);
        var verification = await VerificationCheckResource.CreateAsync(
            to: new Twilio.Types.PhoneNumber(toNumber).ToString(),
            code: code,
            pathServiceSid: _verificationServiceId
        );
        _logger.LogInformation($"Verification Check to {toNumber} details: {verification.Status}");
        return verification.Status switch
        {
            "approved" => true,
            "pending" => false,
            "canceled" => false,
            _ => false
        };
    }
    catch (Exception e)
    {
        _logger.LogError($"Failed to Check Verification Code {code} from SMS Text to {toNumber}! Error: {e}");
        return false;
    }
}

Exception/Log

Error: Twilio.Exceptions.ApiException: The requested resource /Services/**********************/VerificationCheck was not found
at Twilio.Clients.TwilioRestClient.ProcessResponse(Response response)
at Twilio.Clients.TwilioRestClient.RequestAsync(Request request)
at Twilio.Rest.Verify.V2.Service.VerificationCheckResource.CreateAsync(CreateVerificationCheckOptions options, ITwilioRestClient client)
at Twilio.Rest.Verify.V2.Service.VerificationCheckResource.CreateAsync(String pathServiceSid, String code, String to, String verificationSid, String amount, String payee, ITwilioRestClient client)

Technical details:

• twilio-csharp version: 5.52.1
• twilio-aspnet version: 5.37.2
• csharp version: 8.0, .NET Core 3.1.10

[thinkingserious]

Hello @periapsistech,

What namespace are you using? Should be using Twilio.Rest.Verify.V2.Service; (example).

With best regards,

Elmer

[periapsistech]

Thanks for the reply, @thinkingserious. Here's what I have:

using Twilio.Exceptions;
using Twilio.Rest.Api.V2010.Account;
using Twilio.Rest.Lookups.V1;
using Twilio.Rest.Verify.V2.Service;

[thinkingserious]

Hello @periapsistech,

Based on the intermittent nature of the issue, it appears the issue maybe downstream. In order to properly debug this issue, could you please file a support ticket here. Feel free to circle back and re-open if it is determined there is indeed an issue with the latest version of this library.

Thank you!

With best regards,

Elmer

[periapsistech]

@thinkingserious Thanks! Will do..

[darrynhoskingluna]

I have this exact same issue, it fails every time for me.

[isha689]

Hi @periapsistech and @darrynhoskingluna

Please check this doc, this addresses the same exception/error you are getting. Please update if this resolves your issue.