Relay workflows and approval tasks are started and sent as the user that created the relay. Ideally you want to get the box approval task that is sent to the users to approve to look like it is coming from the team that is requesting the approval.

Example: Invoice approval
When an invoice approval relay starts, pick dept. from metadata and start an approval process to the appropriate user as defined in the workflow. The user gets an email that says 'boxadmin' (in out case the user that created the relay) has sent you an approval task.

It would be better to have a senario whereby you could select the 'from' of the approval task creation to be from one of the security 'Groups' in Box. Therefore you could then get an email to say.
Finance Dept. has sent you a Approval Task