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If your iCloud events disappeared from DAKboard and/or you are seeing an "Invalid" message or error icon next to your Apple/iCloud calendar URL, your URL could have been disabled and needs to be recreated.
Regenerate your calendar URL:
Log in to your iCloud account at iCloud.com. Click on the Calendar icon, and click on the sharing icon (which looks like a WiFi icon) next to your calendar name in the left column:
If Public Calendar is checked, uncheck it then click OK. Next, click on the sharing icon again and check the Public Calendar. This will generate a new URL. Click the Copy Link to copy it to your clipboard, and then paste this new URL into DAKboard.
For more information please see our related article How to Add Your Apple iCloud Calendar to DAKboard. You can paste the calendar link into your browser for testing at any time, if it does not download an ICS file it is no longer valid.