On an embedded, iframed Kibana, the user cannot login on Safari nor Chrome. Opening up the fullscreen dashboard in a separate tab, where Kibana is not iframed, allows the user to login on first try.
Are there any workarounds that don't include upgrading to 7.8.1 (where feature is fixed)?
You could also run older browser versions.
That said, you should really upgrade to 7.8.1 or newer. The incompatibilities are purposeful as older version of browser and kibana are no longer considered secure.
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