If you don't want to use Issue security to restrict users to see tickets and also don't want all your users to see all tickets available in Jira, this article will help you achieve this.
By simply adding a user picker custom field in the permission "Browse Project" you can choose the ticket and the user that you want to share with.
1 - Create a custom field with the type "User Picker (multiple users)" and add to the project screen.
2 - Go to the Project settings > Permission and add the custom field on Browse projects > User custom field value > Grant.
3 - Go to the ticket that you want to share with this user and click on Admin > Add field.
4 - After clicking on Edit field, on the next screen, you will type the users' name and Submit.
With the recent changes in Jira regarding the New issue view, the option "Edit field" is not available anymore.
Now, it will be necessary to add the field to the view/edit screen and it will be visible on all tickets, it will not be possible to select only on a specific ticket.
Please, go to Project settings > Screens > Click on to edit the screens for the desired issue types.
Then, search for the field you created previously and add it to the screen.
Hope this helps!
If you have questions or feedback, please let us know.
Angélica LuzAtlassian Team
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