How to Fox iPhone Calendar Invitation Cannot be Sent Error

On iPhone you can use Calendar app to schedule an event with specific time and date. These schedules can now be sent as an invitation to other user via their email address. However, some users mentioned that they have been seeing iPhone Calendar Invitation Cannot be Sent Error while trying to send an invite.

Facing this issue can be very irritation because the reason why the error code is appearing on the user iPhone can differ. But there are some known factors that can trigger this error. For instance, bugs within the Calendar application, corrupted cache files, misconfigured settings, or outdated system software.

If you are facing the same error on your calendar app then don’t worry, we have listed all the possible methods and solutions in the article below to resolve the issue.

Resolve Calendar Application Error on iPhone

As we know that there is no specific or exact reason why you are seeing this error so you might have to try all the methods and find the solution for your case.

Method 1: Restart Calendar Application

Bugs are one of the reasons why this error can appear on your calendar application. Sometimes these are temporary and can be fixed by force stopping the app and then re-opening it again. To force close, you will have open most recently user app menu by pressing the home button or swiping up from the home screen and removing the calendar app from that menu. After the app is closed, re-open the app and see if the issue was resolved.

Method 2: Reboot your iPhone

If restarting the calendar app does not fix the issue then the issue might be caused by glitch within your iPhone. To see if this is the case or not then, try restarting your iPhone. After the reboot, open Calendar app and send schedule invitation to see if the issue was fixed.

Method 3: Disable and Enable Calendar App

Some users reported that their problem was solved once they turn off and on the calendar app. You can also do the same by following these instructions:

  1. Open Settings app on your iPhone.
  2. Move to Name section and select iCloud.
  3. Look for the calendar app from the list.
  4. Tap on the toggle to disable.
  5. Now tap on it again to enable.
  6. Once done, restart your device and check if the error persists.
Method 4: Update your iPhone System Software

Outdated system software leads to many problems and it might be one of the factors why this error occurred on your Calendar application. Check if you have any pending software update and update them. These are the steps on how to do so:

  1. Launch Settings on your iPhone.
  2. Open General option and move to Software Update.
  3. Now see if there are any updates available to download.
  4. If there is, then download and install the update.
  5. Once your device is updated, see if the problem was resolved.
Method 5: Reset Calendar App to Factory Default

If none of the listed methods worked then the last option left with you is to reset your calendar application back to factory default. Doing this will get rid of any corrupted cache files or misconfigured settings which could be the reason for the issue to get triggered. Follow the instruction listed below:

  1. Open Settings app and go to Settings section.
  2. Move to Password & Account and choose the account associated with your calendar app.
  3. Now turn off the toggle beside calendar.
  4. When prompted for confirmation, Delete from my iPhone.
  5. Reboot your device and toggle ON the option from the settings app.
  6. Once done, all your calendar settings are reset.
  7. See if the error persisted.


Being able to share your schedule with calendar app on your iPhone is a very useful feature. However if you are not being able to do it because of iPhone Calendar Invitation Cannot be Sent Error then don’t worry. Follow the methods and the steps mentioned in the article above to resolve the issue without any hassle.

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