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OmniFocus Error: “Calendar at sync.omnigroup.com/username/OmniFocus-Reminders.ics requires authentication”

iOS Error: "Calendar at sync.omnigroup.com/rushfan19/OmniFocus-Reminders.ics requires authentication"

This error message most commonly appears in other apps such as the iOS Settings or calendar clients, and is for the OmniFocus 2 Calendar Alarms Subscription, an optional service that exports due dates to your native iOS Calendar app. If you’re having trouble getting OmniFocus’s calendar subscription to work, the first thing you’ll want to check is your account name and password. Try logging in to your Omni Sync Server account management page to test your credentials.

If OmniFocus’s calendar subscription is still acting up, this error can also occur if you’ve set the calendar subscription to sync through iCloud, since iCloud does not support syncing authenticated calendars. In order to change this, you’ll need to modify the calendar subscription using your Mac’s Calendar application (as it is not possible to modify an iCloud calendar subscription from an iOS device). Follow these steps:

  1. Open the Calendar application on your Mac.
  2. If the Calendar List is collapsed, click the Calendars button in the toolbar to show the calendars.
  3. Right-click (or Control-click) the OmniFocus Reminders calendar subscription in the list, and choose Get Info.
  4. Choose On My Mac from the Location menu, then click OK.
  5. You’ll then need to set up the subscription on each iOS device where you wish to use this. Drag down from near the top of the OmniFocus home screen to reveal the secret bar (on iPhone), or drag down on the home sidebar (iPad and iPhone 6 Plus) to reveal the secret bar, and tap Settings.
  6. In Settings, go to Calendar Integration: Calendar Alarms.
  7. Tap Synchronize Now below the Calendar Alarms toggle, and then Subscribe in Calendar. Enter your Omni Sync Server credentials to finish the calendar subscription process.

Additional information about working with subscribed calendars in iCloud is available on Apple’s Support site here.

If you’ve previously set up an OmniFocus calendar subscription from your iOS device and are seeing this error, or no longer wish to use the Calendar Alarms Subscription, here’s how to remove it. If you’re no longer using OmniFocus, you can skip to step 5:

  1. Drag down from near the top of the OmniFocus home screen to reveal the secret bar (on iPhone), or drag down on the home sidebar (iPad and iPhone 6 Plus) to reveal the secret bar, and tap Settings.
  2. In Settings, go to Calendar Integration: Calendar Alarms.
  3. Turn off Calendar Alarms.
  4. Sync OmniFocus.
  5. Exit out of OmniFocus, and go to the iOS Settings app.
  6. In Settings, go to Calendar, then Accounts, and tap Subscribed Calendars.
  7. Tap the OmniFocus Reminders calendar, then Delete Account.
Last Modified: Nov 8, 2016

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