Symbolise feature layer by colour code attribute

[JoshuaWeiss]

Is it possible to symbolise a feature layer in ArcGIS Online by an attribute that is storing colour-code values (in my case a hex code, as per the screenshot below).

[RussRoberts · Accepted solution]

Its possible to do this in Pro and then share that web map to Online making sure to keep the compatible symbol option in the sharing panel unchecked.

https://support.esri.com/en-us/knowledge-base/how-to-apply-hex-or-rgb-color-codes-from-an-attribute-...

[Adam_Inglis]

Is it possible for the hex colours to appear in the legend as well?  I end up with a single symbol in the Contents pane

I guess I need a way to symbolize by the hex field and the rock type field in this geology example:
 

[RussRoberts]

This is a known limit when you are using the attribute driven colors/primitive overrides. Its not creating a Types/Unique Renderer style that has a list of labels and values.