Why can't my health code find the itinerary on my mobile phone?

Why can't my health code find the itinerary on my mobile phone?

Hello, darling

No activity trace was found on the health code. To view the activity track, you need to check the places you have been in the last 14 days from the travel itinerary code. Now communication is an important means for people to communicate with each other. The communication company can locate where you have been. When you leave your city and arrive at another place, you will receive a message "Welcome to ……" from that place, so that our activity track can be found on travel itinerary!

I hope I can help you.