Error : "The requested feature is not available" production when sent sms

Question

question

Doanh Nguyen asked Aug 8, '21 Anirban answered Aug 8, '21

When i sent sms with my production, It's error : "The requested feature is not available"
but it working with sandbox :
My production app key :

3YUGZu3BQj-94Mtc6qoydQ

rest api

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Using the RingCentral Phone for Desktop, you can dial or receive test calls, send and receive test SMS or Fax messages in your sandbox environment.

Download RingCentral Phone for Desktop:

Tip: switch to the "sandbox mode" before logging in the app:

Answer 1 · 2021-08-08T19:30:15Z

Anirban answered Aug 8, '21

Have you checked the below references:

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Attachments: Up to 8 attachments (including images) can be used with a maximum of 1.0 MiB each and 10.0 MiB total.