Hi there!
We're currently experiencing an issue during the Atheon phase where we can't open the portals for the teleported team because [b]the plates won't trigger[/b]. We're standing on the plates (which are clear of ads), and they won't trigger. Our solution was to do damage to Atheon, this way we could get the portals open but only after the third oracle wave was destroyed.
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The enemies on the plates don't matter, but make sure the away team is destroying the Descendent/Predecessor Gatekeeper while they deal with the Oracles. The Gatekeepers prevent the sync plates from being activated, like in the pre-boss 'Gatekeeper' encounter.