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Docusign SMS error: RECIPIENT_SMS_AUTH_PHONE_MISSING:

  • February 23, 2026
  • 2 replies
  • 8 views

We have Docusign Envelopes that go out to contacts.  The envelopes go out by email but their cell phones are used to authenticate who they are.  When I set up a zap to send an envelope, I keep getting this error from Docusign:  

RECIPIENT_SMS_AUTH_PHONE_MISSING: SMS authentication phone number cannot be empty. 

 

The receipent’s phone number is mapped in the zap but I feel there is a different field that needs to be mapped.  Any suggestions?  The AI bot was no help.

 

2 replies

Sparsh from Automation Jinn
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Hey ​@Chrissnyny,

The error usually means that you are not passing the SMS authentication field. It’s a specific field and it’s different than the Signed phone number. 

Which particular Zapier action you are passing? Does it show a parameter where you can pass this SMS authentication field. If not, then it might be a limitation of the integration. 

But there is a workaround by querying the API directly using Webhooks in Zapier action. Here is the API documentation about it here- https://developers.docusign.com/docs/esign-rest-api/reference/envelopes/envelopes/create.  You have to call this particular endpoint- /restapi/v2.1/accounts/{accountId}/envelopes. There you have to send the SMS authentication number in the JSON.

Here is an article about Webhooks in Zapier- https://help.zapier.com/hc/en-us/articles/8496326446989-Send-webhooks-in-Zaps.

I can understand that it’s a bit more technical and complex but if it’s important for you, you can give this approach a try. Hope it helps!

PS: If you need more active help, I’m happy to connect through my Zapier Solution Partner page if you’d like to reach out here- https://zapier.com/partnerdirectory/automation-jinn


Troy Tessalone
Zapier Orchestrator & Solution Partner
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  • Zapier Orchestrator & Solution Partner
  • February 24, 2026

Hi ​@Chrissnyny 

Help us have more info by post screenshots showing how your Docusign Zap step is configured along with the encountered error.