So sorry, when I write the question I thought it was a search and not the registration of a problem.
Yesterday I enable the User Story Map plugin (http://bauer-information-technology.com/jira-addons-agile-story-map/#!jira-addons-agile-story-map) on our Jira Cloud account and everything seems to be right but I can't access the plugin board.
I guess it's a problem on the plugin, not on JIRA so I already open a ticket on the vendor's site.
Thank you, anyway.
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