Calendar invites

Hello pmblaine,

Please review the information outlined in the following link to ensure the correct process is being used to send invitations in Calendar, so we can make sure there's no issue there: Send invitations in Calendar on iPhone

Send invitations in Calendar on iPhone

In the Calendar app , you can send meeting and event invitations. iCloud, Microsoft Exchange, and some CalDAV servers also let you send meeting invitations. (Not all calendar servers support every feature.)

Before you begin

Before you can invite people to events you’ve scheduled, you need to make sure your calendar accounts are turned on.

• Go to Settings  > Calendar > Accounts, then select an account.

• Check if Calendar is turned on.

For more information on how to add calendars, see Set up multiple calendars on iPhone.

Invite others to an event

You can invite people to an event you’ve scheduled.

1. Tap the event, then tap Edit near the top of the screen.

2. Tap Invitees.

3. Enter the names or email addresses of people you want to invite, or tap  to select Contacts.

Note: For you to send a calendar invitation to a contact, they must have an email address. See Add and use contact information on iPhone.

4. Tap Done.

If you don’t want to be notified when someone declines a meeting, go to Settings  > Calendar, then turn off Show Invitee Declines.

Note: With Microsoft Exchange and some other exchange servers, you can invite people to an event even if you’re not the one who scheduled it.

Please also ensure the contact details are listed correctly to rule out a possible issue there. This link explains how to review and edit contacts: Edit contacts on iPhone

Thanks!