Not receiving SMS message recently

Good afternoon,

We have integrated with the sandbox environment and receiving text messages no problem for the past few months. Since this morning, we have not been able to send a message, even directly through the Swagger test. Not sure what could be affecting this but any assistance would be appreciated:

{

"uri": "https://platform.devtest.ringcentral.com/restapi/v1.0/account/xxx/extension/xxx/message-store/405615...;,

"id": 4056154004,

"to": [

{

"phoneNumber": "+xxx"

}

],

"from": {

"phoneNumber": "+xxx"

},

"type": "SMS",

"creationTime": "2018-02-21T18:47:36.000Z",

"readStatus": "Read",

"priority": "Normal",

"attachments": [

{

"id": 4056154004,

"uri": "https://platform.devtest.ringcentral.com/restapi/v1.0/account/xxx/extension/xxx/message-store/405615...;,

"type": "Text",

"contentType": "text/plain"

}

],

"direction": "Outbound",

"availability": "Alive",

"subject": "Test SMS using a RingCentral Developer account - test",

"messageStatus": "Queued",

"smsSendingAttemptsCount": 1,

"conversationId": 4905502763407868000,

"conversation": {

"id": "4905502763407867532",

"uri": "https://platform.devtest.ringcentral.com/restapi/v1.0/conversation/4905502763407867532";

},

"lastModifiedTime": "2018-02-21T18:47:37.189Z"

}