Error - Your response to the invitation cannot be sent

Error

While sending meeting invites on iPhone, the error message pops up as:

Calendar Invitation - Your response to the invitation cannot be sent.

Root Cause:

• The error is generated by the 'My Exchange' account.

Workaround/Fix:

Turn off iCloud Contacts, Calendar, or Reminders and turn it back on.

• 1. Tap Settings > [your name] > iCloud. (If you're using iOS 10.2 or earlier, go to Settings > iCloud.)
  2. Slide to turn off Contacts, Calendars, and Reminders.
  3. If you see your calendars or reminders on iCloud.com or any of your devices, you can choose Delete from My [device]. If not, choose Keep on My [device].
  4. Wait a few minutes, then turn on Contacts, Calendar, or Reminders again.
  This should resolve the issue the pop-up message should not appear while sending the meeting invites.