I had one reservation that I made online and had the same situation. The CM couldn’t find it b/c she said it was not connected to my room reservation.
Now, apparently this cannot be the case because before I was told the ONLY way to check is that I had to read off all of my ADR numbers to the CM to check and the only way to add people was to cancel the ADR and reschedule.
My last call, the CM just looked up the same reservation in question without the conf. # and added 2 people keeping the same confirmation. (this is the non-connected ADR) Just ODD. Oh well, third call was the charm I guess.
I keep a copy of all reservations in my travel folder and also make index cards for each day that I carry with. I include all events we need to remember (Fantasmic 8:30 ect…), ADR #, crowd calendar suggestions in case the park is crowded.
Can never be too prepared!