[JIRAALIGN-1288] Kanban: It is impossible to add user with alphanumeric UID to the members of Kanban Board

Issue Summary

Kanban: It is impossible to add a user with alphanumeric UID to the members of Kanban Board

Steps to Reproduce

1. Login
2. Go to Administration>People.
3. Find the user that has alphanumeric UID
4. Go to Kanban Board and try to add this user to Board.

Expected Results

It's possible to add a user with alphanumeric UID to the members of Kanban Board

Actual Results

It is not possible

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available