The Passkey is not something that is assigned to a specific site, it is assigned to the user. The reason is simple, you may not be folding for a "team" but still want it to be under your name. So you input a name, but not a team number.
So you have to request a Passkey from them for your personal use. Not for use with TF. So no you are not getting the SMP Bonus like those of us that are using the Passkey. I know I have one for myself and input it on all my F@H items.
Yha its mainly security thing. This way, if a bot gets folding again, and steals your name, when its caught, you won't lose all the points you've accumulated under the passkey.