Hello Jean,
Welcome to Atlassian Community!
It's possible to add participants that don't have an account, but when doing that, an account will be created for them.
To allow this, it's necessary to let the project open, so anyone can be added to the tickets.
Go to Project settings > Customer permissions (classic project) or Project settings > Channels > Customer permissions (next-gen project). On this page, change the "Who can access the portal and send requests?" to "Anyone with an account on" and also, "Who can customer share requests with?" to "Any customer or organization".
After saving these settings, you can click on "Change the global settings" or go to Cog icon > Products > Configuration and allow customers to create their own accounts.
After that, it will be possible to add people that don't have an account on the site as participants on a ticket.
Regards,
Angélica
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