What does it mean to check the health code before the tour guide leaves the group?

Please show your personal health code for access. In the tour guide work, "going out of the group" refers to the whole process of accompanying the service work, while "going to the group" refers to the ground service work, one is to accompany the tour guide in the service work of taking a group tour, the other is to accompany the tour guide in the process of taking a group tour, and the third is to take the group as a tour guide and bring objective light as a receiver.