FAQ:
Q: Can you get an 18 man fireteam?
A: No, because your in-orbit fireteam cannot exceed 12 members, and it won't let you launch the raid 12.
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Q: Can you get 6 player GMs/Dungeons?
A: Should be able to! You should be able to get 12 by having 9 join on 3! This is all very new so not everything is known yet.
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Q: Does this work with Garden?
A: Yep!
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Q: We can't get it to work, are they joining too quick or too late?
A: The timing is VERY precise. Keep trying, maybe change hosts.

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"Originally found by these guys: https://raid.report/pgcr/8051546967
Specifically, Pie tried to join in on a full raid and ended up getting in as the 7th which led to us doing some testing and finding you could get two full fireteams in."

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Bungie, unless this is damaging something, please take your time in patching this. Please. Thank you.