You must enable the option to customers to add participants to tickets, as per the instructions in theĀ Enable Request Participants section in the link below:
https://confluence.atlassian.com/servicedesk/managing-customers-660967473.html#Managingcustomers-Enablingrequestparticipants
Then the customer will see an option in the Customer portal to add participants to their tickets.
Cheers!Teilor
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