Square Appointments don't show up on iOS calendars because calendar hasn't been selected yet. Try the following (and forgive me if you've already done so):
- Open the iOS Calendar app.
- Tap Calendars at the bottom middle of your screen.
- Ensure that the Square Appointments calendar is listed under your email address and has a red checkmark to the left-hand side.
While we don't officially support syncing with any calendars except the Google Calendar on the desktop and the Google Calendar app, these steps should make your Square Appointments calendar visible in the iOS app.
