Custom Symbology not showing up in Web App Builder

[GIS_utahDEM]

I have a custom symbology layer that I am using in a web map (successfully) but when I try to use that web map in a web application (using the web app builder) the symbology doesn't show up how it's supposed to (pictures attached). Is this a known issue? Is there something special I need to do to the custom symbology?

[RussellRoberts1]

Are these symbols coming from a web style?

[GIS_utahDEM]

@RussellRoberts1 Yes, I published it from Pro. 

[RussellRoberts1 · Accepted solution]

These are not supported in 3.x JSAPI apps like WAB. If you use this in a 4.x app like Experience Builder the symbols will show up as expected. 

[GIS_utahDEM]

Okay, thank you!