Prevent rotation of symbols in Map service export request

[LeighHunt]

I have a system (ArcGIS Server 10.5, ArcGIS JavaScript 4.3) whereby I'm allowing the user to rotate the map, and then request a PDF output of the map.

I need to ensure that the symbology is always oriented upwards - i.e. not rotated with the dataframe.

I've updated the following registry key, and this helps ensure that when viewed in the MXD, and created as PDF output, the icons are oriented correctly, i.e. towards top of page/screen.

HKEY_USERS\<USERID>\Software\ESRI\Server10.5\Symbology\Settings\RotateWithTransform

However, in my web client, when my app does a MapServer export with rotation, the symbology is always oriented North - e.g.: 

Is this normal behaviour? Labels are oriented correctly - see further example, again rotated 15 degrees:

Is there something I can do to ensure that the icons are not rotated?

Cheers,

Leigh

[LeighHunt · Accepted solution]

So, I confirmed with Esri that this functionality is not supported.

[NicolasGIS]

Thanks for the update.

I was looking for the same functionnality.

Too bad it is not supported specially with 4.X JS API which offer map rotation for free !