We are going March 22-24 (3 full days)
I was able to book 3 PF for MK on 3/22 , but it is only letting me book 1 at Epcot and 1 at HS for 3/24. Can you only do 3 for MK??? I know it will be busy at this time!
You CAN book 3 at all parks including Epcot and HS. Epcot and HS have a tiered system which allows you to pick "one from tier 1" and "2 from tier 2"
It sounds like you only selected your tier one FP and not your tier 2 FP. go back, and look again.
Mk and Ak do not have the tiers. You can pick any 3 FP.
In Epcot
You can select 1 Tier 1 attraction and then 2 Tier 2 attractions when choosing your initial three FP+ for a day.
Tier 1
Frozen Ever After
IllumiNations: Reflections of Earth
Soarin' Around the World
Test Track
Tier 2
Disney and Pixar Short Film Festival
Journey Into Imagination with Figment
Living with the Land
Meet Disney Pals at the Epcot Character Spot
Mission: SPACE
Spaceship Earth
The Seas with Nemo and Friends
Turtle Talk with Crush
In Disney's Hollywood Studios
You can select 1 Tier 1 attraction and then 2 Tier 2 attractions when choosing your initial three FP+ for a day.
Tier 1
Beauty and the Beast-Live on Stage
Fantasmic!
Rock 'n' Roller Coaster
The Great Movie Ride
Toy Story Mania
Tier 2
Disney Jr. Live on Stage
For the First Time in Forever: A Frozen Sing-Along Celebration
Indiana Jones Epic Stunt Spectacular
MuppetVision 3D
Star Tours
Twilight Zone Tower of Terror
Voyage of the Little Mermaid