The weather data from Weather Kit REST API doesn't contain SF Symbol name. Is there a way to get the SF Symbol name by "conditionCode"?

I'm trying to make a custom SF Symbol. I've made some new custom symbols successfully, combining existing SF Symbols, so I understand the process. But as soon as I use vector files from my previous work, I get the error, "The provided variants are not interpolatable." - even though it has shapes made with vector path. Template set up - Variable I use sketch to work on the template I have separate layers for Ultralight-S, Regular-S, Black-S File saved as SVG What is wrong with my template? Thanks!