Only account admins can approve account scopes while sending document with group user(sub account)

client is facing issue with Adobe Sign service. Ideally we use Adobe admin user account for user authentication while sending the documents. But, client has requirement to use ‘sub account(non-admin)’ registered under admin account to use for authentication while sending a documents.

Though Adobe is claiming that they supports non-admin  sub account for sending documents, we are receiving error(Only account admins can approve account scopes) from Adobe service while using sub account for sending the documents.

we are tried to send document with sub account with below rights

PFA,

Thanks