Unity3D + Firebase Invites, email works, sms fails

Question

I am unable to get SMS to work for Firebase invites. Currently, when I use the invite function, it opens my contact list in my phone, I can select a user email address, alter my message if I want and then send. This works.

If I select a phone number however, it just closes my contact list and returns to the app sending nothing. I'm at a loss. I get no error code and the success is returned with no id's included.

public Task<Firebase.Invites.SendInviteResult> SendInviteAsync()
{
    Firebase.Invites.Invite invite = new Firebase.Invites.Invite()
    {
        TitleText = "Test title",
        MessageText = "Simple test body",
        CallToActionText = "Why you no work?",
        DeepLinkUrl = new System.Uri("http://my.app"),
    };
    return Firebase.Invites.FirebaseInvites.SendInviteAsync(
        invite).ContinueWith<Firebase.Invites.SendInviteResult> 
        (HandleSentInvite);
}

Firebase.Invites.SendInviteResult 
HandleSentInvite(Task<Firebase.Invites.SendInviteResult> sendTask)
{
    if (sendTask.IsCanceled)
    {
        Debug.Log("Invitation canceled.");
    }
    else if (sendTask.IsFaulted)
    {
        Debug.Log("Invitation encountered an error:");
        Debug.Log(sendTask.Exception.ToString());
    }
    else if (sendTask.IsCompleted)
    {
        foreach (string id in sendTask.Result.InvitationIds)
        {
            popMNG.CreatePop("invite info: ", sendTask.Result.ToString() + " 
            and the id is:  " + id, "close", null);
        }
    }
    return sendTask.Result;
}

public void SendInvites() {
    SendInviteAsync();
}

What I've tried:

• Verified no special characters
• Verified not going over character limits
• I have my SHA keys all all other features work in the app. (functions, messaging, storage, database, auth and analytics)
• I've tried logging all output but nothing is returned.

Answer 1

I've experienced the same issue (not on Unity) when there was an issue with my SIM Network (since it sends SMS from your mobile number, and emails from your email address).

Are you running this on a mobile with a valid SIM card inside? If so, it's worth checking if you experience the same issue with the quickstart sample app.