Send SMS block from Twilio shortcode?

Is it possible to send SMS messages from a Twilio shortcode? I’ve tried entering into the configuration page just the numbers, +{numbers}, and +1{numbers} and they all return the same error, mentioning “from number NULL”.

Screen Shot 2020-05-04 at 5.34.59 PM

Update: both Airtable support and Twilio support told me it’s the other service’s problem. So I set up an integration with Integromat, and it works fine.