Yeah.. I see the issue. The ritemaster just isn't in the room. Closing app, doesn't fix it. Reloggin doesn't fix it. Only fix is abandoning quest and doing the whole bunch of crap all over again... ugh...
Old thread, sorry for necro but this happened to me today.
Fix: I believe this was because I was in a guild-mate instance (ported to guild from elsewhere) ... to fix, I zoned elsewhere and re-ported to Artaeum from a wayshrine so that I was in the correct instance for the quest. I was then able to use the dreaming portal correctly to gloam.