Hi @Svetlana !
Sorry if I didn't understand your question correctly, but would you like to know more details about the additional security verification for your recipients or would it be about the Two-Step Verification that users of your account can use to access Docusign (to manage envelopes)?
If you are referring to SMS authentication of your recipients, I recommend you to watch this video belowand check the following article: How Phone Authentication Works
However, if you want to know more about the Two-Step Verification that will affect how your users will log in to the platform, I recommend you read this article below: Set Up Two-Step Verification With Text or Call
Please, let me know if I was able to help you with this question. If so, could you please select click on the "Select as Best" option? Thank you!
"Select as Best" below if you find my answer is a valid solution to your issue and mark it as resolved.