Hi @Margarita Peña ,
When you have the permission browse project you can see every issue within that project. The only solution you have to limit the amount of issues a person sees is to use Issue security
You should create an issue security scheme, add one level and add your internal users (which maybe in a user group or maybe you've made a different role for internal users, then you can use that role too) and add 'Current assignee' to that level.
Make the level 'default', this means that every new issue will have that level set and only the internal users group and the current assignee can see that level. (You might want to consider also adding the reporter if external company users may also create issues.).
After you created the issue security scheme, you need to associate it with your project.
Good luck,
Rudy
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