Hello! Noticed that I have [JIRAUSER##] instead of Jira Username in history for new users and get e-mail notifications as from Anonymous for these users. How can I revert to previous settings? Is there any way to change user keys for existing users?
Jira 8.4.1
Thanks in advance
P.S. It's crucial to fix e-mail notifications, user keys aren't so important. I've joined them in one question thinking the root cause is the same.

