Yes and you also must be in the park to get the FP, it also must be after the window and from what I see, the window for the FP is 2 hours, you can't make them months, weeks, days or even that day while you are home.
This is a good article concerning this and you should read it fully. Highlights are:
While this is a change for Disneyland's Fastpass system, this is not the west coast implementation of Fastpass+ as some rumors have suggested, nor should you expect to be outfitted with a Magic Band anytime soon. Fastpass may be getting a shiny new digital interface, but the nuts and bolts of the program remain the same.
Unlike the Fastpass+ system at Walt Disney World, the MaxPass system does not allow users to select Fastpasses months, weeks or even days in advance. This is still a same-day program, and users must activate the entitlement on the day they visit the park.
Nor can users make Fastpass selections from home before even heading to the parks. Visitors must be inside a theme park to collect a digital Fastpass to use the same day, though MaxPass users need not walk to their selected attraction to claim a Fastpass ticket. A MaxPass user can walk onto Main Street, U.S.A. and claim a Fastpass for Splash Mountain if they want, without ever stepping foot in Critter Country. The MaxPass app also allows users to claim a Fastpass for a ride in the other theme park, so a user in Disneyland could claim a Fastpass for Radiator Springs Racers before park hopping.
Regardless of how they obtain their Fastpass, users are still subject to the same policies. Tickets are issued on a first-come, first-serve basis. Users can generally not obtain another Fastpass until two hours after they obtain the first Fastpass, or at the end of the return window of the first Fastpass, whichever comes first.
When it comes time to ride, MaxPass users will likely scan a barcode displayed from the screen of their app at a new portal installed at the Fastpass return gate. Paper Fastpass ticket holders will scan the barcode on their ticket to access the return queue. Disney has been testing these portals at various times for well over a year, and recent building permits issued indicate that installation is ready to proceed.
Here is the link where I pulled these from.