Specific User is not visible in assignee drop down

[Dwaraka Kr]

Specific user (vicm and siarunac) is not visible in assignee drop down.. Is there any thing i am missing? Pl help

[Nic Brough -Adaptavist-]

In the permissions for the project, do these users match any of the rules for "assignable user"?

[Mirek]

There are to main reasons of not showing on the assignee drop down list

• Are those users active in Jira? 
• Are they added to a project and having Browse Project and Assignable User permission?

If both answers are yes then you need to provide a little bit more information here to troubleshoot.