What is " The Request for account "iCloud" failed. The server responded with "400" to operation CalDAVUpdateShareesQueuableOperation

Hello Kirkdasilva,

It sounds like one of your computers is not syncing correctly to a shared iCloud calendar. I recommend the troublehsooting from the article named:

iCloud: Troubleshooting iCloud Calendar

http://support.apple.com/kb/ts3999

Try each of these steps, testing after each to see if the issue is resolved:

• Make sure that you are using OS X Lion v10.7.5 or later. Learn how to verify the version of OS X you are using.
• Make sure your computer is online. Attempt to view www.apple.com. If you can't connect to the Internet, your iCloud calendars and events will not update in Calendar or iCal. Learn how to troubleshoot your Internet connection.
• Open a secure website to test if ports 80 and 443 are accessible. Calendar requires port 443 access to iCloud in order to push and fetch updates to and from the iCloud Calendar servers.
• Choose Apple () menu > System Preferences, then click the icon for iCloud. Make sure that you're signed in to the same iCloud account that you're using on your other supported devices.
• Make sure that you enter and update calendar information in the iCloud section of Calendar or iCal. Only calendars and events in the iCloud section of the Calendar or iCal Calendar list are updated in iCloud. Both Calendar and iCal for Mac support the display of and interaction with multiple accounts and datastores, such as iCloud, On My Mac, Exchange, and Google. This makes it easy to create or modify events or calendars in a section of Calendar or iCal that may not be updating iCloud. Learn more about moving local calendars to iCloud.
  • In some cases, you may find that you have data duplicated in both the local On My Mac and the iCloud sections of Calendar or iCal. Learn more about resolving this issue.
  • You can make the iCloud calendar your default calendar for all new events. In Calendar, choose Calendar > Preferences, then click General. In iCal, choose iCal > Preferences, then click General. Locate the Default Calendar setting and choose one of the Calendars under the iCloud heading. Close the Preferences window to save the change.
• Turn iCloud Calendars off and back on:
  1. Quit Calendar (or iCal).
  2. ChooseApple () menu > System Preferences, then select iCloud.
  3. Deselect the checkbox next to Calendars (or Calendars & Reminders in Mountain Lion and Lion).
  4. Close System Preferences and wait about a minute.
  5. Open System Preferences and select iCloud.
  6. Replace the checkmark next to Calendars (or Calendars & Reminders in Mountain Lion and Lion).
  7. Close System Preferences.
  8. Open Calendar (or iCal) and test to see if the issue is resolved.
• Restart your computer. This may sound simple, but it reinitializes your network and application settings and can frequently resolve issues.

Thank you for using Apple Support Communities.

Take care,

Sterling

I am having the same problem as kirkdasilva and I did exactly what you suggested above, and I'm still getting that error message when I try to share a calendar in iCal (Calendar). My OS is Mavericks. This is very frustrating. I can't use iCal if I can't share entries with friends and family.

This is sooooo frustrating I also get this message

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

AND i have followed all the steps listed by Sterling R, and still no joy - HELP

I also keep recieving this message every time I try to make a change on the Calender.

I find it strange because the syncing of the calender between my mac and iPhone still works fine. It's just the error message that keeps popping up.

(I also have followed all the steps listed by Sterling R)

Operating from OSX Mavericks

Not sure if anyone else has figured this out, but I hit the problem this morning and did a little debugging. Turns out I had included a special character "-" in my calendar name and iCloud didn't like that. Once I renamed the calendar to remove the "-", the error went away. Hope this helps others.

I'm having this problem, too. No weird characters in the calendars I want to share. Tried all of Sterling's recommendations PLUS tried sharing the calendar via iCloud on the web, where it gives the error message pictured below.

After all of this, now the address I want to add is showing up as invited (so it's not throwing the error anymore) BUT the invitation isn't showing up in the inbox of the invited gmail account.

Added data point:

Tried sharing from my phone; no error message but also no invitation showing up in the intended inbox or gcal, nor does the desktop Calendar application think that the invitation has been sent.

Similar issue here but slight difference: Some recipients get the 400 error, some do not, but NO ONE (that I have tried) gets an invitation. Also, making it public results in a link that when I try to go to it, says something like "there is no calendar here".

Back in earlier days sharing was a trivial matter. We've come so far. . . .

Based on my further research (and my recollection of why we were initially using google calendars instead of icloud), I think the issue is that iCloud calendars just won't talk to google accounts. I'd love somebody to tell me I'm wrong about this...

I'm also having the same problem. All of sterlings suggestions attempted unsuccessfully. I also am using gmail and am really annoyed if that's still the problem. I'm not changing my gmail email address but gmail and apple just don't get along...

Following Sterlings instructions fixed it for me; but 'm not syncing to Google's calendar.