Avatar Thumbnail Though Discord

I’m trying to implement a discord logging system for moderation actions in my game. I’ve got everything working, except for the avatar’s thumbnail showing up.

Code
local function SendDiscordMessage(title, desc, username, reason, userid)
	local data = {
		["embeds"] = {{
			["title"] = title,
			["description"] = desc,
			["thumbnail"] = {url = string.format("https://www.roblox.com/bust-thumbnail/image?userId=%d&width=420&height=420&format=png", userid)},
			["fields"] = {
				{
					["name"] = "Username",
					["value"] = username,
					["inline"] = true
				},
				{
					["name"] = "Reason",
					["value"] = reason,
					["inline"] = true
				}
			}
		}}
	}

	local data = HttpService:JSONEncode(data)
	local success,errorm = pcall(function()
		HttpService:PostAsync(url, data)
	end)
	if not success then print(errorm) end
end

image