Mobile or web push tokens are associated with the app or device (browser) on which the user has given consent to receive notifications. Users may have more than one token - this depends on the number of apps or devices (browsers) they use and on which they have given consent for notifications. As part of a campaign, pushes will be sent to all possible tokens for a contact.
Example: a user uses 3 browsers (Chrome, Firefox, Edge) on all of them, they have given consent for notifications. 3 tokens have been assigned to them. During the campaign, 3 push messages will be sent to the user for each token, and automatically from 1 person there will be 3 recipients.