Error message: Account lacks sufficient permissions. In-session permission required when specifying a captive recipient.

Our B2B software has an embedded e-Signature integration with DocuSign where we allow our software users to create envelopes and tag recipient fields for other software users.  Our integration utilizes a “system user” who authenticates to the customer’s DocuSign account and all subsequent envelopes are created and signed on behalf of that system user. 

For the error message: Account lacks sufficient permissions.  In-session permission required when specifying a captive recipient.

the customer’s system user has the “DS Admin” permissions profile.  I welcome any ideas where the client’s DocuSign Admin can go to enable a “in-session permission”?