Bar not showing

[vaderag]

Describe the bug
I've tried to follow the documentation but can't seem to get the bar showing - this is most likely user error but I don't really know where else to go for help!
I think this should be simple as I don't need to pull specific attributes etc

Your card configuration

type: custom:timer-bar-card
entity: sensor.p1s_01p00a380200353_remaining_time
duration:
  units: minutes
bar_width: 60%

mushroom:
  color: green
...

Debug information
State: 369 (state mode = idle)
Mode: idle (explicit; guess mode produces N/A)
Duration: second
Time remaining:
Counter:
Attr: {"unit_of_measurement":"min","device_class":"duration","friendly_name":"P1S_01P00A380200353 Remaining time"}