GetLegendGraphic incorrect display error

[mayleendv19]

I have tried to display the correct legend in terria
But I still can't achieve it.

LINK: https://www.geoportaligm.gob.ec/terria#CA_BAHIA
I have 5 groups of which there are 11 layers, 9 of them have general styles or legends and they are the ones that appear by default.

For example, in the city of Bahia, in the Soils category, the general legend is displayed.

But I need a style defined for said city to appear as follows:

Under the query:
https://www.geoportaligm.gob.ec/igm_afc/igm_ca2022/ows?service=WMS&version=1.3.0&request=GetLegendGraphic&format=image/png&width=20&height=20&layer=v_suelo_a&style=stl_bahia_ttdp

This is my JSON file:
CA_BAHIA_N.json

I tried to add the legend using a URL as follows but it reflects error:
"legendUrls":
{
"mimeType": "image/png",
"url": "https://www.geoportaligm.gob.ec/igm_afc/igm_ca2022/ows?service=WMS&version=1.3.0&request=GetLegendGraphic&format=image/png&width=20&height=20&layer=v_suelo_a&style=stl_bahia_ttdp"
},