+Share option is not available to a customer of our jira project on the ticket, Why is that? He needs to share it with some of other customers on the same project.
a user that's trying to see + share is not a reported of a ticket.
most likely, it's due to restricted Customer Permissions. In the project go to Administration > Customer Permissions.
You can set with whom a Customer can share their request - this also affects who they can @-mention. You can pick between anyone in the project, people from their Org or people from their Org + manually inserted Accounts.
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