Can't find 'Add Person' to share my Calendar.

On my iphone 15 (bog standard one) I don't have the 'Add Person' on my screen to share my Calendar with someone. Can anyone advise please? Below in the cut and copy from previous posts that isn't working for me:

Share iCloud calendars on iPhone - Apple Support

You can share a calendar with one or more people in iCloud. Those you invite receive an invitation to join the calendar.

1. Go to the Calendar app  on your iPhone.
2. Tap Calendars at the bottom of the screen.
3. Tap  next to the iCloud calendar you want to share.
4. Tap Add Person, then enter a name or email address, or tap  to browse your contacts.
5. Note: Your contacts must have an email address to share an iCloud calendar. See Add and use contact information.
6. Tap Add, then tap Done.