I'm unable to add Licenses to my Organization from the yellow Add More Licenses button.
Organizations that are paying via invoice instead of credit cards cannot use the Add More Licenses button, as this function is dependent on having a payment method on file in order to perform the request.
Attempting to User the yellow Add More Licenses button will generate an error message in DataCamp: "Failed to add more licenses for this organization".
If you have a DataCamp for Business subscription and are paying via invoice, you must use the Invite Members button instead within the Members tab of the Organization. Inviting the Members will create an invoice on our end for the prorated additional License(s) as well as update the Licenses count.
Note: We're working on either making the error message more clear or removing the Add More Licenses button completely when not appropriate to avoid confusion.