How to fix iCloud Calendar (iCal) error 400 on macOS (Catalina/Mojave/High Sierra…)

How to fix iCloud Calendar (iCal) error 400 on macOS (Catalina/Mojave/High Sierra…)
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Are you having a trouble with iCloud Calendar like this:

The request for account “iCloud” failed. The server responded with “400” to operation : CalDAVAddSubscriptionCalendarQueueableOperation

Then, here are few simple steps to fix it:

The issues must be gone now! Ask me if you have any further problems :slight_smile: