Trouble Vaccines have to be approved in the destinationThe destination Country has to approve the Vaccines you have recieved, Astra not approved in US China and Russia have thier own which are not approved in Canada this is going to become a mess.
If your Vaccination is not approved in the country you are traveling to you will have to quarinitne apon arival, travalers to Canada with a Vax not approved by Health Canada will have to quarintine.
This will take a long long time to sort out loosing $13 million a day while this happens is really going to hurt