How to Fix Calendar Invitation Cannot Be Sent On iPhone

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Many users are facing this annoying error on their Apple iPhone or iPad. The error saying ” Calendar Invitation- Your response to the Invitation Cannot be sent- Ok” on Apple iOS Calendar App is coming because you’ve sent a response (accepted or rejected) to a calendar invitation and because of an error, the response cannot be sent, that’s why you will keep receiving the notification. this error is very frustrating because you will get this popup continuously.

This pop-up error notification is infected almost all iPhone Models, iPhone 8/ 8 Plus, iPhone 7/ 7 Plus, iPhone 6/ 6s and iPhone X, iPhone XR users. It keeps showing every five to six minutes even after pressing the Ok button. It is also resulting in the iPhone to hang or freeze for some users.

Note: Method 3 is working for most of users. so you can try solution 3 first and if this does not work, then you can try other methods.

Below we are sharing troubleshooting guide. So you can troubleshoot this error. If you have this issue as well, this article will help you fix it:

Fix Calendar Invitation Cannot Be Sent

Method 1: Restart Your iOS Device

Firstly turn the iPhone off and then turn on. So if there may be some minor glitch with the calendar app it might get fixed by restarting your phone.

Method 2: Off Calendar App

Go to your iOS device (iPhone or iPad) setting. Now Tap on Your Name > Cloud

  1. Now search calendar app and toggle off
  2. Wait one minute
  3. And now toggle on the calendar app
  4. Restart your iPhone
iCloud Calendar app

Method 3: Reset Calendar App and Restart your iPhone or iPad

Go to iPhone or iPad setting, then open Passwords & Accounts. Choose your account (under the accounts section).

toggle off calendar app

Note: Select the account that linked with Calendar (iCloud, Exchange, Gmail, etc)

  1. Now turn off the calendar by sliding. You get a warning message like this, but don’t worry your data is safe. Your data will back after restarting and turning the calendar on. Still, you can back up all your data to iCloud. In case of any data loss, you can restore your old data back in your iPhone from iCloud.
  2. Now restart your iPhone
  3. And turn on your calendar app
  4. If the problem is not solved, then repeat this step for all other accounts in that device.

Method 4: Update Your Device to Latest version

If your iPhone is not updated to the latest version, then please update your iPhone iOS version. Updating your iPhone to the latest version of iOS may fix this error. So do this if this solution might be able to solve this error.

iPhone software Update

Method 5: Force Stop and Reopen Calendar

Force stop the calendar app on your iOS device and reopen again. You can do this by following these steps.

  1. If your device has a home button then simply double click on the home button. Now you will see the recently opened apps. Next, find the calendar app and close it by swiping right or left. If the device iOS device does not come with a Home button then simply swipe up from the bottom of the screen and then search the Calendar app and swipe up to force close it. Then reopen it.

Method 6: Refresh Calendar App

This method can be helpful if there is issue with data mismatch in your device between your Calendar app and the application server. because data sending is process between server from your device. so sometimes the data process maybe got interrupted which transmits any response or activity that you take to not get carried out.

here is a way that can help you to Fix Calendar Invitation Cannot Be Sent On iPhone. To fix this, you need to clean up your iPhone or iPad calendar app data and have a refreshed copy of data sync from the server.

Here how you can do this:

  1. Open Settings, then go to Passwords & Accounts option or Tap on your Name > Cloud.

2. In this option click on the account linked with your device Calendar App. if you are using multiple accounts on the iPhone or iPad, then you can follow this step for all accounts. Now select that account which is causing this error on your iPhone or iPad then tap on the iCloud option.

iphone icloud

3. Now toggle off Calendar App button to turn off the app in that linked account. here you get a confirmation notice of “Are you sure you want to continue? All calendars will be removed from your iPhone” will appear. click Delete from My iPhone to confirm the process. Here don’t worry about your data because when you turn it on you get all from the server itself.

toggle off calendar app
turn off calendars 473×1024

4. Again go to Settings, now tap on the General option then tap on the Shut Down button.

iphone shut down

5. Now Start your Apple iPhone or iPad.

6. Here is the time to turn on the Calendar app. to do that open Settings on an Apple device, then tap on the Passwords & Accounts or your Name > iCloud option, and now toggle on the calendar of your linked account. now it’s Depends on the size of data, It will need several minutes to sync and retrieve all Calendar data from the server.

After going through these step steps, the Calendar app should now run without any errors. if these steps don’t work then you can follow other methods in this article.

The Bottom Line

Kindly follow these solutions step by step and you can Fix the Calendar Invitation Cannot Be Sent On iPhone or iPad error in your Apple device. If your problem isn’t able to solve this article, then walk to an Apple Store and discuss the issue with them. You can also call Apple Customer Care to find this error solution.

If you have any questions, comment down below. If you able to solve this issues, comment down below which step you used to fix it.

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58 thoughts on “How to Fix Calendar Invitation Cannot Be Sent On iPhone”

  1. DOES NOT WORK !!!!!
    My problem started when I Updated the Phone to the Latest version.
    Very desapointing……. what apple do to our devices.

  2. Thank you so much! this has been annoying me for such a long time. Solution 3 worked, not the others.

  3. Solution #3 works!!!!!!!!!!!!!!!!
    Solution #3 works!!!!!!!!!!!!!!!!
    Solution #3 works!!!!!!!!!!!!!!!!

    Thanks very much!

  4. I have now tried every suggestion in the article – currently calendars is removed from my phone, I have restarted several times – and everytime I restart my phone it pops up again. I will have to get a hold of apple customer care. Hope that helps.

  5. Thanks for the step by step solution. Unfortunately none of the steps worked for me. For those that it didn’t for, what did you do? Thanks!

  6. Yep — solution #3 worked over here too. So happy to no longer see that little annoyance of a message show up 17 times every time I accessed the phone. Thx for the clear instructions!

  7. Solution 3 worked for me. Hallelujah! I was so nervous that my work calendar and emails would not re-sync but everything did! Thank you!

  8. I love how glitchy IOS STILL is! Its 2020 and this rudimentary bullshit still happens! You would think, SOMEONE in Cuppertino might have noticed this and fixed the glitch! But, NOPE!

    Thank you for addressing it for the money hungry slobs at AAPL!

    • No software made until now which is not faced any glitch. However, if you need any assistance I will try to help you.

  9. not working for me. so annoying. it definitely has something to do with the outlook calendar invites. Those are the ones causing the problem, I think. But none of these solutions stopped it from happening for me.

  10. None of these methods worked for me either. Tried several times. Unfortunately all Apple stores near me are closed due to Covid. Rahul, if you find any other methods, please post. Thank you for these clear instructions, they solved it for some people here.

  11. Method 3 worked!!! Thank you so much! This has been annoying me for weeks. I’ve tried so many different solutions and Method 3 finally did it. So thankful for you!

  12. I did a variation on Solution #3 that worked: instead of deleting the whole account, I just deleted the calendar for that account.

    Very helpful article, Thanks!

  13. I echo everyone’s comments that you have saved me going mad. Method #3 worked as my IT department only knew about #1. Very helpful thanks again

  14. Hi, thanks a lot for the tip. Solution no. 3 worked for me as well. I thought I was alone in this problem. This problem really annoyed me.


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