Permissions Denied on delegatedParticipiantSets

Hello,

I'm using following endpoint for delegating:

/agreements/{agreementId}/members/participantSets/{participantSetId}/delegatedParticipantSets

My account has agreement_write scope enabled with group modified.

My content type for tests is:

{
  "memberInfos": [
    {
      "email": "someEmail@address.com",
      "securityOption": {}
    }
  ]
}

I'm getting follow error:
{ "code": "PERMISSION_DENIED", "message": "The API caller does not have the permission to execute this operation" }

Response Code: 403

Is there a bug in the Adobe Sign API? What persmission do I need?