I start with jira 1 week ago with free plan.
I configured to create tasks from email. And now I ran into a strange problem. If the task was created through an email, then I cannot assign it to one of the users. This user is not in the list for assignment in this scenario. But if you create a task from Jira interface, then this user is visible.
I looked through all the rights, one is the same for all users.
Help, please, I do not understand what to do?