The currently available dungeon IDs are:

Main Dungeons:
avikancamp
avikancolony
trinkcolony

Random Encounters and Micodungeons:
thea-desertwetlandsmicrodungeons
avikanencounter
avikanencounter2
avikanhostileencounter
avikanviolatedencounter (not yet available, but listing it already as it'll be available in the next update)
centensencounter
trinkencounter

Instanced Worlds: (use /warp instanceworld:dungeonId instead of /placedungeon)
avikanoutpost
vanguarddronebattle