Deleted

they can see the ga unless they synced their profiles.
if they win they will get the key, unless you chose to reroll the winner for not being in the group (invalid entry).

The entry should be valid

Awkward.
But, yeah- You have grounds to reroll if you want to, and you'll probably have to if the winners've synced. Otherwise it should be fine.

Flip side, staff has indicated to me that for mishaps like that, if you want to delete and inform them, they'll "refund" your missing slots so you can repost.

TempeteJoachim (Support)
Unfortunately we are unable to edit giveaways settings so the only solution would be to delete and recreate these.
A moderator can add back the giveaway slots if needed.

I'd poke staff about it, just to confirm what your options are.