You don't link guests to the DAS; that has to be done by the CM when requesting the DAS.
To get a DAS, you either have to do the online screening or in person at the park. The person requesting DAS has to be present. A MDE account with everyone involved needs to be set up beforehand, not sure who has to "own" it. We used my daughter's account for our last trip the first time I requested DAS, and that worked just fine.
I think i got it.
(1) sign in to MY MDE account
(2) enter all part tickets (which should be registered to individual ticket holder)
(3) Sign in to MY DISNEY account when request CM chat to get DAS (for my parents), not sure if possible to do BOTH parents in one single chat
(4) provide guest to CM - this is based off the Park Ticket #s ???
done.
if cannot be done two DAS request in one single chat, then do separately? but both time use MY Disney Account during sign in when request chat?