Functions are showing up

I am trying to make a datapack for version 1.21 but a couple of the functions are not showing in game.
There are 2 files that are giving me trouble
They are as follows:
kick_all.mcfunction
execute as @a run kick @s
start_session
say After 20 minutes EVERYONE will be kicked to conserve resources.
tick sprint 28800s
schedule function voteafk:warn_kick_all 900s```

And the voteafk:warn_kick_all function does appear ingame.

Can anyone spot anything wrong here?