How to add a Signature Tab inside Dynamic Table?

Hello,

I’m using the DocuSign eSignature API to create an envelope draft from a template that uses DocGen and contains a dynamic table. After creating the draft and adding rows to the table programmatically, I attempt to add signature tabs anchored to text placeholders inside the table.

The sequence of operations is:

• Create a draft envelope from a DocuSign template using the Envelopes API (POST /v2.1/accounts/{accountId}/envelopes).
• Add dynamic table rows via DocGen Form Fields API (PUT /v2.1/accounts/{accountId}/envelopes/{envelopeId}/docGenFormFields).
• Wait for DocGen rendering to complete.
• Add signature tabs via Create Recipient Tabs (POST /v2.1/accounts/{accountId}/envelopes/{envelopeId}/recipients/{recipientId}/tabs) using SignHere tabs with AnchorString values matching the placeholders inside the table.

The envelope and recipients are created correctly, and the table rows appear as expected. However, the signature tabs are never added, List Tabs (GET /tabs) shows SignHereTabs = 0, and the anchors are not resolved, even though the anchor text clearly exists in the rendered document.