Going out almost 180 days into August, every restaurant that is open for dinner and takes ADRs has dinner availability for Party of one except 'Ohana, Olivia's, and Trail's End.
So it seems that these 3 locations simply do not take ADRs for party of one.
I made a reservation for party of 2 online last night. Tonight I called and modified the ADR to a party of one. "Liz Joy" was very helpful over the phone and cheerily changed my ADR to indicate I would be dining solo.
Just checked my ADRs on line and the change is entered correctly. I was able to print it out in case I have any trouble at the podium.
Just booked Ohana and Trails end which I had to do via DVC member services as the website wont take my booking number (known issue)... got all the ADR's I wanted as a solo diner EXCEPT Ohana and Trails end which had to be booked as a party of 2 to get avalability!