For a user in JIRA system, why sometimes you are not able to add him/her to a specific project?

[Tim Ma]

A user was newly added to the JIRA system. You can see that he is active on the system. But you could not find him on the "Add People" picker list. His name just would not appear on the picker list of the project to add people. What could be the reason for this to happen? 

[Trudy Claspill]

Hello @Tim Ma 

The tags on your post indicate you are using a Free subscription. Are you really using a Free subscription, or are you on a Trial of a Standard or Premium subscription?

I ask because in Free subscription the Add People button is disabled.

It would be available, though, if you are on a free Trial of a Standard or Premium subscription.