Think it's mostly a willingness to have your full background check report in multiple locations & sign their release.
Got fnf-approved in March, but then had to send all my info again to some SS who had to have an fnf-approved notary for a specific job. BancServ is Fidelity-owned, but (weird) they have 'their own list' and if they need an fnf-approved notary... send it all again! I never took a test. In all honesty, I am not very impressed by being Fidelity-approved. Seems to me that it has done nothing but expose my NPPI in more places than I think necessary. I also did a lot of Fidelity signings before being approved.