When you're signed up as a Partner (that means you're a Distributor, Reseller, Contractor or Installer) you can access your Client's Devices to view, setup and control them in assistance means. You can request access or get invitations to from Clients.
Tap New client to create a new one
Fill the form and tap Create new client
After the client is created an invitation Email will be sent and his/her card will be shown in the Active Clients list.
Also this screen has Awaiting Your Confirmation section where you can see invitations to join Client's Organizations. Once confirmed you can view and/or manage Clients' Devices according to permissions Clients' have granted you .