DashPass Family sharing is a benefit that is available on most standard monthly and annual DashPass plans. This allows DashPass subscribers (primary account holders) to share a select number of their benefits with one other household member (secondary account holders), without having to share account login details or pay for another DashPass membership.
Ineligible primary account holders include (but are not limited to) those account holders who are on partnership plans such as Chase, MasterCard, and DoorDash for Business. The quickest way to find out if your account is eligible for Family Sharing is to go to the Manage DashPass page (Account > Manage DashPass).
You can only share your benefits with one other account at a time. To share with a new account, you must first remove the current secondary account here, or from your account page (Account > Manage DashPass > Family Sharing).
Thanks OP, was able to successfully use/link it while under the Amazon Prime 2 year free membership.