Dashboard Auto-Refresh rate

Hi,

we are displaying dashboard on TV on open space hall. To keep TV login secure, we are using account without licence, and this user is Viewer only. But when we tried to set up Auto-Refresh rate to 1 minute (it is important to see dashboard with live data) it displays error message.

However I can set this up as licenced user without any issues.

I did not found any restrictions for viewer permision level, so i guess this is only bug.

(Dashboard is shared via workspace + via share button directly, i've tried Chrome, Firefox, IE browsers - same result)

Any advice?

Thanks

Dan