Make sure your user has the JIRA Users Global permission. The group users is included on the JIRA Users global permission by default, you probably gonna need to ask a user who has access to the instance and belongs to the administrators group to verify this (since you can't log in).
If you're using JIRA OnDemand this could be caused by lack of Application Access to JIRA as well, please check if you user has it. This should be the direct link to that page https://example.atlassian.net/secure/admin/user/ApplicationAccessConfig!default.jspa
Hope this information helps!
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