Calendar invites

Hey there Ossabka,

Thanks so much for using Apple Support Communities.

Sending an invite via Calendar is a feature that not all calendar servers support. It is possible that the contact you are inviting is using an unsupported service provider, which is why they may not be able to accept the invite. Does this happen with everyone you try to invite or does it seem to affect only certain contacts?

This article has more information on how this process works: Send invitations in Calendar on iPhone - Apple Support

We'd like to share some information below, as well. This information can be found here: If people don’t receive invitations sent from Calendar on Mac - Apple Support. While that article is specifically addressing invites when using Calendar on macOS, much of the information included is relevant for iPhone as well:

* Make sure that your card in Contacts includes all of your email addresses.

* If the email address you used to send the invitation isn’t listed, Calendar might not recognize you as the person who created the event or calendar. See Edit contacts.

* Make sure you’re using the correct email addresses by sending an email to each invitee. This also ensures that there’s nothing wrong with your account settings or internet access.

* Make sure there’s nothing wrong with your internet connection or the internet connections of the people you’re trying to invite.

* If you made changes to the event or shared calendar, refresh your calendars.

* For shared calendars, make sure your account information is correct in Accounts settings.

We hope this does the trick for you!

Cheers.