Emergency Assistant does NOT send message to contact

In Garmin Connect, I've created and selected 1 contact in Safety & Tracking, the phone number of contact is with country code as: +1658962315 (sample dummy number here).

When I active the Emergency function in Watch, I see the screens are:

Sending Assistance Alert

Sending

Assistance Alert Sent

then the information screen: My Info, Name, Location, etc.

But the contact never received the message.

Then I go to my iPhone, I cannot see any message sent.

Is there any other settings should be done?

Please advise.

Thank you.

H