What version of Jira are you using?
Are the issue/tickets in a Software project or a Service Desk project?
For a Software project, a person must be a user (consuming a license) in order to view the issue data. If the issues are in a Service Desk project, then there is the concept of Agents vs. Customers; Agents are Jira Service Desk licensed users who have permissions to work on the issues, while Customers are non-licensed users who have limited permissions to see and comment on issues through a customer portal.
With regard to "sharing" the issues, again it depends on if the issues are in a Software project or Service Desk project and what you mean by sharing. With a Software project, users must have permissions to browse the project in order to be able to see the issues. If the manager needs to be able to just look up the issues, then being a licensed user with Browse Project permission in the project should be enough. If the manager needs to receive automatic notifications about updates to the issue, then that requires looking at the Notification Scheme for the project to see who receives notifications and figure out how to include the manager.
If the issues are in a Service Desk project, then the ability for customers to Share tickets is one of the project configuration options. This document discusses that configuration:
https://confluence.atlassian.com/servicedeskserver0411/managing-access-to-your-service-desk-1021223892.html
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.