Greetings,
I created a Layer Package in Pro and shared it to my content, and then added it to a preexisting AGOL map.

It added to my map - but the symbology I created in Pro was not maintained. No big deal, I can at least change the color to distinguish it from another point layer, right? No. I get this when I try to edit the style:

I've changed symbology and color in AGOL countless times, I just did it in one of the other layers in the same map w/no problem. But with this particular layer, it will not allow me to select any of the other color options or to create a new one.
I tried just adding the layer as a shapefile and I get the same result. I can't change the color. I can change it to another shape or symbol, but I don't want to do that. What am I doing wrong?
Thank you for any advice you can offer!!