Twilio Group SMS throwing 30008 Unknown errors for network provider numbers

Question

I am using the following code to send Group SMS

$conversation = $twilio->conversations->v1->conversations
                    ->create(["friendlyName" => "Home-buying journey"]);

$twilio->conversations->v1->conversations($conversation->sid)
                    ->participants
                    ->create([
                         "identity" => "realEstateAgent",
                         "messagingBindingProjectedAddress" => "My Twilio Phone Number"
                    ]);
$twilio->conversations->v1->conversations($conversation->sid)
                   ->participants
                   ->create([
                       "messagingBindingAddress" => "My T-Mobile Number"
                    ]);
$twilio->conversations->v1->conversations($conversation->sid)
                   ->participants
                   ->create([
                       "messagingBindingAddress" => "My Google Voice Number"
                    ]);
$twilio->conversations->v1->conversations($conversation->sid)
                   ->messages
                   ->create([
                       "body" => "Hi there. What did you think of the listing I sent?",
                       "author" => "realEstateAgent"
                    ]);

This code is working good but it is sending the group SMS only to the Google Voice Number not to my T-mobile number. When I check the Twilio Messaging logs, 30008 Unknown error was thrown for my T-mobile number. When I reply back the Group through my Google voice number, the T-mobile number getting the messages.

I tried messagingBindingProxyAddress=>Twilio Phone Number for my participants. In that case my t-mobile number getting SMS but it doesn't get the other participants details.

I want to send the Group SMS to network provider number(like my T-mobile Number) also and all the participants in the group SMS should know other participants. What causing that 30008 error? And How to fix it?