Allow apps to use your reminder information
Some apps and websites can use your reminder information to provide you with services and features. For example, an app might use your reminder information to help you set up a reminder. See Control access to your reminders.
To authorise an app or a website to use information from your reminders, click Allow in the dialogue. If you don’t want to authorise the use of your reminder information, click Don’t Allow.
If you allow third-party apps or websites to use your reminder information, any information they collect is governed by their terms and privacy policies. It’s recommended that you learn about the privacy practices of those parties.
You can review and change which apps and websites can use your reminder information in Privacy & Security settings.
Choose Apple menu > System Settings, click Privacy & Security in the sidebar, then click Reminders on the right. (You may need to scroll down.)