If an offer does not display as an option under the Services tab in a subscriber account, try these steps:
Make sure that the pin for the subscriber address actually falls within the service area with the desired offer.
Admin utilities > Service offers > Select offer: Search for and select the specific service offer. Make sure that the “Visible on Public Shopping Cart?” has “Yes” selected. If not, click EDIT in the bottom right hand corner and toggle the “Visible on public shopping cart?” to be active.