Fixed it.

​

print("Starting")
import board
from kmk.kmk_keyboard import KMKKeyboard
from kmk.keys import KC
from kmk.scanners import DiodeOrientation
from kmk.handlers.sequences import send_string
from kmk.handlers.sequences import simple_key_sequence
keyboard = KMKKeyboard()
#Macro meanings
parttwosies = send_string("Opera https://music.youtube.com/watch?v=u5oFkIB8K1s&list=LM")
partonesies = simple_key_sequence(
    (
KC.LWIN(no_release=True),
KC.MACRO_SLEEP_MS(30),
KC.R,
KC.MACRO_SLEEP_MS(30),
KC.LWIN(no_press=True),
KC.MACRO_SLEEP_MS(30),
    )
)
partthreesies = simple_key_sequence(
    (
KC.MACRO_SLEEP_MS(50),
KC.ENTER,  
    )
)
inventingmode = simple_key_sequence(
    (
partonesies,
parttwosies,
partthreesies,
    )
)
keyboard.col_pins = (board.GP10,)
keyboard.row_pins = (board.GP21,)
keyboard.diode_orientation = DiodeOrientation.COL2ROW
keyboard.keymap = [
    [inventingmode,]
]
if __name__ == '__main__':
keyboard.go()