Twilio Config Issues

I initially set up Twilio in Oct 2022. It worked with Sytist and I verified I could send and receive messages. But, I never enabled automated messaging..

I now would like to start using it to send automated messages about galleries, etc. However, since Oct 22, there are now a bunch of new A2p Regulatory Compliance hoops I had to jump through with Twilio. 

I was able to complete the registration process yesterday and verified I could now send messages again from Sytist. However, none of my test text replies were showing up in Sytist. This morning, none of the messages I send from Sytist are being received. In addition, all of my test send messages only show a status of "queued" in Sytist ... even though they were actually delivered to my cell phone yesterday.

I haven't modified any of the API settings, but i noticed Twilio changed the messaging service to the new one that was recently registered. I think it used to be a webhook.

I'm totally stuck. How do I troubleshoot this?

here's a screenshot

Go to Settings -> SMS / Text Messages -> Sent Messages. Mouse over the information icon next to the delete icon and it may give you an idea what the issue is.

I dug into the monitor logs on the Twilio side. Twilio is receiving a 403 Forbidden error when trying to access https://www.paulmanoian.com/clients/sy-inc/twilio-...

The 403 error explains why Sytist is able to send message, but not receive SMS message update. But, I can't figure out when a 403 is being generated.

<code><em><!</em><em>DOCTYPE</em> <em>HTML</em> <em>PUBLIC</em> <em>"-//IETF//DTD HTML 2.0//EN"</em><em>></em> <span class="token"><</span><span class="token">html</span><span class="token">></span><span class="token"><</span><span class="token">head</span><span class="token">></span> <span class="token"><</span><span class="token">title</span><span class="token">></span><span class="token plain-text">403 Forbidden</span><span class="token"></</span><span class="token">title</span><span class="token">></span> <span class="token"></</span><span class="token">head</span><span class="token">></span><span class="token"><</span><span class="token">body</span><span class="token">></span> <span class="token"><</span><span class="token">h1</span><span class="token">></span><span class="token plain-text">Forbidden</span><span class="token"></</span><span class="token">h1</span><span class="token">></span> <span class="token"><</span><span class="token">p</span><span class="token">></span><span class="token plain-text">You don't have permission to access this resource.</span><span class="token"></</span><span class="token">p</span><span class="token">></span> <span class="token"><</span><span class="token">p</span><span class="token">></span><span class="token plain-text">Additionally, a 403 Forbidden
</span><span class="token plain-text">error was encountered while trying to use an ErrorDocument to handle the request.</span><span class="token"></</span><span class="token">p</span><span class="token">></span> <span class="token"></</span><span class="token">body</span><span class="token">></span><span class="token"></</span><span class="token">html</span><span class="token">></span> </code>

Then something else on the server is blocking it. 

"The HTTP 403 Forbidden response status code indicates that the server understands the request but refuses to authorize it."