Demo account- API-Created Envelopes Are Not Sending Email Notifications (Dashboard Works Correctly)

Hello DocuSign Support,

I am currently integrating DocuSign using the API with a developer (demo) account, and I have encountered an issue that is preventing me from completing my integration.

Initially, when I sent envelopes from my application using a template, the recipients did not receive any email notifications, even though the API successfully created the envelope and returned a successful response. Surprisingly, the next day, without making any code or configuration changes, the same API calls started working correctly and recipients received the emails as expected.

However, the following day, the exact same issue returned again. Once again, without any changes to my code, template, or DocuSign configuration, email notifications stopped being delivered.

Currently, the behavior is as follows:

• The API authentication succeeds.

• The envelope is created successfully.

• The envelope status is "sent".

• The recipients are correctly assigned.

• No API errors or exceptions are returned.

• However, no email notification is received by any recipient or the sender.

To verify whether the issue was related to the template, I manually sent the same template directly from the DocuSign web dashboard.

In that case, everything worked perfectly:

• Email notifications were delivered immediately.

• Recipients received the signing request.

• The signing process completed successfully.

This indicates that the template itself is working correctly. The issue only occurs when the envelope is created and sent through the API.

I have also verified the following:

• Tested with multiple recipient email addresses.

• The envelope status is always "sent".

• No API exceptions or warnings are returned.

• The exact same API request has worked previously without any modifications.

• The issue appears and disappears without any changes to the code or account configuration.

Could you please help me understand:

1. Is there any known issue with email delivery for API-created envelopes in the demo environment?

2. Could my developer account or IP address have been temporarily restricted or rate-limited?

3. Is there any additional logging or diagnostics that I can use to determine why email notifications are not being sent?

4. Are there any account-level settings that could cause envelopes sent via the API to behave differently from those sent through the DocuSign web dashboard?

This issue has completely blocked my development and delivery. Since email notifications are not being sent when using the API, I am unable to demonstrate the integration or continue with testing.

I would greatly appreciate any guidance or assistance in resolving this issue.

Thank you for your time and support.