I cannot tag people in comments or assign a person in the assignee field

Question

I have a cloud JIRA account and everything works fine except the tagging/ assigning function -

(1) I can't mention people in the project
(2) I can't change the assignee to myself because the name isn't there on some of the boards.

Is it that I have to ask for a certain permission to do that? 
They work on my personal JIRA board, though.

Joyce Huang_dju5o6 · Answer

Thanks so much for the quick response! I will try!

Ollie Guan · Answer

Hello @Joyce Huang ,

Please contact your Jira administrator to check your global and project permissions.

* global permissions
* project permissions

View and select users or groups from the user picker, and share issues. Users with this permission can see the names of all users and groups on your site. They can share issues and @mention people on issues.