I also encountered this error and it took me a while to solve. So here is my step by step guide. You have to open SF Symbols and chose any icon you want. Click on "File" -> "Export Template". Here I got an SVG that I dragged into Figma. You will have a thick, medium and thick Icon in there. On the left you have the group "Symbols" and in this group the groups for the thicknesses. Inside of these groups is where you have to place your vector icon. After you are done, highlight the whole thing (named after the icon you exported) and go the export svg section in Figma. Make sure to: 1. check "Include "id" attributes" and 2. to uncheck "outline text". After you have exported your version, you can now import it into SF Symbols. After you export it (again) for the final use. Thank you apple for building this mediocre walled garden of painful icons