You cannot assign one issue to multiple assignees. It is an impossible thing to do in Jira. Because this is against the principle of how Jira operates. If you assign one issue to multiple people, the responsibility of the issue will be vague and not clear. That's why you cannot do it.
However if it's very crucial, you can create optional configurations. For example, you can create a mail group that consists a group of people, create a user with this mail group on Jira and assign the issue to this user. But I would not recommend such a thing because of the reason I explained above.
If you explain the business reason why you want this, maybe we can find another solution that would fit your needs.
As @bitvoodoo nick suggested below, you can use watchers feature of Jira. Check out this blog post about watchers and mentions. If you want your TL and PM to get notification every time the issue is updated you can use watchers. If you want them to get one time notification you can use mentions.
Other than that you can create issue filters for more than one issue and other people can subscribe to these filters to get timely notifications that you manage.
Has there been any movement on this? The participants and watchers are great if you are keeping an eye on certain issues. However, sometimes multiple tecnicians work together on the same project/task and it takes several hours to complete-- this only allows time credit due to one technician for that task.
If anyone else is also concerned about this-- I have suggested the techs to link tickets to the original request in order to record their time working on an issue. Of course, this woudl only apply to longer projects.
However, it would be great to have multiple assignees as an option so that the "Linked" tickets don't bring up the ticket count.
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