Its work for me
{
module: 'calendar',
header: 'Icloud Calendar',
position: 'top_left',
config: {
calendars: [
{
symbol: 'calendar-check-o ',
url: 'https://p02-calendars.icloud.com/published/2/xxxxxxxxxxxxxxxxxxxxxQhtoAvoFiIwGI1-5MBbuND5g_96k2kQyqGV90wUFfxxxxxxxxxxx'
}
]
}
},
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