520 plus
In China, use IPhone, register the account in "garmin.com" instead of "garmin.cn", since account in "garmin.cn" can not let me connect strava.
I add emergency contacts with China Mobile Phone number and with the "+86" prefix, and email is a icloud mail address, and the emergency contact email received the "Emergency Contact" response mail.
But the emergency contact's phone and email does not receive the incident message while the IPhone app notified me that the message has been sent.