I have tried to do it by Bulk Change and individually. I have Project Lead and project Administrator rights in JIRA. When I tried to change using the Bulk approach, the Reporter shows a system generated String of numbers and characters. When I tried to make the change individually, JIRA doe snot give me any user options neither accept any user that I type. I tried different formats e.g. tim.smith, tim.smith@companyname.com. tim smith, @[deleted].smith
Nothing. Can anybody help?