I don't think Emiko has any applicable knowledge, but here's a d20 roll just in case:
[1d20] = 15 + any applicable skill bonus.
Emiko does have the Research skill (at +7) and access to her datapad (adds +2) with whatever standard software is on it. Plus, since Toril doesn't have an InfoNet, she has a -4 circumstance penalty on her roll. That would be a total of 20.
The description for the datapad in the SFH is a little vague on how much it comes with. We'll assume a standard datapad comes with basic networking access software and typical software suites that would come on a computer or tablet in
our modern age. Plus, since she knew she was going into hostile territory, she'd have
basic details on Toril and it's star system, as well as some encrypted data on this region of space (the Aegis Sector). I doubt very much she would have a detailed database on who's who in the Freedom League. If that info fell into the wrong hands, it could be disastrous.
Still, a roll of 20 should give you something about the rest of the Solders of Freedom, if not the Arcanum itself. Arassil's callsign is Rebel One, of course. She is a silver half-dragon. Rebel Two is mysterious figure on her team. His name isn't known as he is an infiltrator and rarely fights alongside the others. Rebel Five and and Six are two brothers known as Bakner and Samuall. Emiko doesn't know their last name. There is also Rebel Eight who is named either Marta or Marda. Rebel Four, Seven, and Nine died on Breka. Rebel Four was a halfing nicknamed 'Carboncopy'. She doesn't have any details on the other two.
The reason these names are know is because the Soldiers of Freedom are famous in the Outlands. Not all of the personal names are known, but Arassil, Caranarth, and the two brothers are all wanted by the Dragon Empire. There are rewards for their capture so and Imperial word often shows the latest crimes they've committed on public vid-screens and electronic billboards. Amongst other freedom fighter, they are seen as legends. Carboncopy was one of those famous rebels too, before he died. Rebel Two is wanted as well, but the empire gave him the nickname of Bloody Jack, to make him sound more menacing.
As for the Arcanum, all she has on the group is that in is considered an important behind-the-scenes power group in the Aegis Sector. Wild speculation has them as radicals that wish to topple the Dragon Empire or as a cabal of deadly wizards that have some dark purpose. However, most of these rumors are likely just propaganda put out by the Dragon Empire.
Here's one for Yin Hun as well:
[1d20] = 12
but he doesn't have any ranks in knowledge, so probably a bust.
You're right, he doesn't really have anything that would apply.
Edit: Does Yin Hun already have a designated callsign?
I haven't given him one, so you can pick one for him, if you like.