Why is a shared Google Calendar not showing on iPhone?
Most of the time the calendar was never turned on for sync in the first place. Google treats a calendar someone shares with you as "off" by default — it sits in your account but doesn't sync to phones or third-party apps until you explicitly enable it on a page called syncselect.
This catches people constantly because the shared calendar shows up fine on calendar.google.com in a browser, which checks a different setting than the one mobile apps and the native iOS Calendar app read. If you've connected Google Calendar to get alarms for events, a calendar that never syncs means those events never produce an alert either — see Google Calendar alarm not syncing for the broader troubleshooting path.
What is calendar.google.com/syncselect and how do I use it?
Syncselect is a Google Calendar settings page that controls which of your calendars — including ones shared with you — actually sync to mobile devices and connected apps. Open it in any browser while signed into the Google account that received the share.
Microsoft's own support documentation for Outlook mobile directs users to this same page when shared Google calendars go missing, telling them to open the syncselect link and confirm the relevant calendars have checkmarks next to them. The page lists every calendar tied to your account with a checkbox next to each one. Tick the box for the missing shared calendar, then give it time — Microsoft's guidance notes it can take roughly 20 minutes before a connected app picks up the change. The same delay applies whether the app reading your calendar is Outlook, Apple Calendar, or an alarm app like Pealo.
Why don't secondary Google calendars sync to iPhone automatically?
Secondary and shared calendars don't sync automatically because iOS and the Google Calendar app only display calendars you've explicitly checked as visible, separate from whether they're enabled in your account at all. There are two layers to get right, and missing either one hides the calendar.
The first layer is the Google Account level — syncselect, covered above. The second is the in-app visibility toggle. Google's own fix-sync guidance says to open the Calendar app, tap the menu, and confirm the box next to the calendar's name is checked. A calendar can be fully synced at the account level and still be invisible on screen because this second checkbox is off. If you're juggling a shared calendar alongside your own, syncing multiple Google calendars on iPhone walks through managing several at once without losing track of which is visible where.
What sharing settings on iPhone affect a shared calendar?
The permission level set by the calendar's owner determines what you can see and whether events generate alerts, not just whether the calendar appears. A calendar shared with "See only free/busy" won't show event details or titles, which can look identical to a sync failure from the receiving side.
Ask the owner to confirm they shared with at least "See all event details," and check your own account wasn't added under a different email than the one signed into the Calendar app on your phone. Google also warns that adding an event to a calendar not associated with your Google Account can mean it never shows up in the Calendar app — the same logic applies in reverse when a shared calendar lives under an account the Calendar app doesn't have added. Compare how this differs across providers in Outlook desktop vs mobile reminder differences, since Outlook, iCloud, and Google each handle shared-calendar permissions slightly differently.
What order should I check these settings in?
Work top-down: account-level sync, then app-level visibility, then permission level, then app refresh. Skipping the order usually means re-doing steps because a later fix masks an earlier one.
| Step | Where to check | What it fixes |
|---|---|---|
| 1. Account sync | Off by default | Enable via calendar.google.com/syncselect |
| 2. App visibility | Hidden checkbox | Tick calendar name in Calendar app menu |
| 3. Share permission | Set by owner | Confirm "See all event details" was granted |
| 4. Account match | Wrong email | Verify the Calendar app has the right Google account added |
| 5. App refresh | Cache | Quit and reopen, or remove and re-add the account |
If events are visible but still silent, that's a separate problem from visibility — see Google Calendar alarm not ringing on iPhone for alert-specific fixes.
Does a hidden shared calendar affect alarms in apps like Pealo?
Yes. An alarm app can only arm alerts for events it can read, so a shared calendar that's toggled off at the Google Account level never reaches the app's event list at all, regardless of in-app settings. Fixing visibility in the native Calendar app and in Google's account settings is a prerequisite before an alarm connection will pick up events from that calendar.
Once a shared calendar is confirmed visible on both calendar.google.com and the iOS Calendar app, Pealo can read its events through the Google Calendar connection and turn them into AlarmKit alarms that ring through Silent mode and Focus. For teams running separate work and personal calendars side by side, work and personal calendars with one alarm list covers combining several Google calendars — shared or owned — into a single alert stream.
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