Get error when starting type username at Assignee field

[Zina Design]

Some log details.

What`s wrong with this user? Please help.

2017-10-09 17:31:59,859 http-nio-8080-exec-22 ERROR litoli 1051x148423x1 177urgc 192.168.1.1,127.0.0.1 /rest/internal/2/user/mention/search [c.a.p.r.c.error.jersey.ThrowableExceptionMapper] Uncaught exce
ption thrown by REST service: User 'Nataliya_Nedostupova' has no unique key mapping.
java.lang.IllegalStateException: User 'Nataliya_Nedostupova' has no unique key mapping.
at com.atlassian.jira.user.ApplicationUsers.from(ApplicationUsers.java:46)
at com.atlassian.jira.mention.SortedMentionableUserSearcher.lambda$searchForUsers$2(SortedMentionableUserSearcher.java:213)
at com.google.common.collect.Iterators$7.computeNext(Iterators.java:652)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
at com.google.common.collect.Iterators.addAll(Iterators.java:361)
at com.google.common.collect.Lists.newArrayList(Lists.java:160)
at com.google.common.collect.Collections2$FilteredCollection.toArray(Collections2.java:217)
at com.google.common.collect.ImmutableList.copyOf(ImmutableList.java:258)

[Steven Behnke · Accepted solution]

https://confluence.atlassian.com/jirakb/jira-login-fails-with-user-exists-but-has-no-unique-key-mapping-373261121.html

This is a complex issue. It'd be unwise for me to copy bits of this KB article. Please read through it.

[Zina Design]

thank you. Problem fixed.

[Steven Behnke]

Happy to help