Koa.js: ctx.setcookie() fails to set cookie - node.js

Question

In my server.js code below I am setting up a middleware that should pass through Shopify OAuth and then redirect to the / route.
The '/' route, and its redirect url, are loaded in an iframe inside the shopify Admin area. I do see the page that / redirects to. But no cookies are present.
Related to the cookie settings, I am accessing this route in a web browser and on a secure https connection.
I am using Google Chrome Version 79.0.3945.88 (Official Build) (64-bit). I'm also using EditThisCookie browser extension to see the cookies that are present for the domain.
Can anyone tell why the cookies I am trying to set in server.js are failing to set?
import "isomorphic-fetch";
require("dotenv").config();
import Koa from "koa";
import Router from "koa-router";
import session from "koa-session";
import authorizeForShopify, {verifyRequest} from "#shopify/koa-shopify-auth";
const koa = new Koa();
const router = new Router();
const {SHOPIFY_BUYUSED_API_KEY, SHOPIFY_BUYUSED_API_SECRET, SHOPIFY_BUYUSED_SCOPES} = process.env;
koa.keys = [SHOPIFY_BUYUSED_API_SECRET];
koa.use(session({secure: true, sameSite: "none"}, koa));
////// Shopify OAuth //////
koa.use(authorizeForShopify({
apiKey : SHOPIFY_BUYUSED_API_KEY
, secret : SHOPIFY_BUYUSED_API_SECRET
, scopes : SHOPIFY_BUYUSED_SCOPES.split(",")
, afterAuth(ctx: Koa.Context): void {
console.log(`=====inside afterAuth()=====`); // I don't see this log statement
const {shop, accessToken} = ctx.session;
console.log({ // also I do not see this one
message : "from inside afterAuth()"
, shop
, accessToken
});
// cookie setting
const cookieOptions = {
httpOnly: true,
secure: true,
signed: true,
overwrite: true
};
// neither cookie is present in EditThisCookie
ctx.cookie.set("buyUsed_shopName", shop, cookieOptions);
ctx.cookie.set("buyUsed_generalToken", accessToken, cookieOptions);
ctx.redirect("/");
}
}));
////// Routing //////
router.get('/', async ctx => {
// ctx.body = "Koa server running, '/' route triggered"
ctx.redirect("https://storage.cloud.google.com/buy_used/consoleLog.js");
});
koa.use(verifyRequest());
koa.use(router.routes())
.use(router.allowedMethods());
const port: number = Number(process.env.PORT) || 8080;
koa.listen(port, undefined, undefined, () => console.log(`=====Koa listening on port ${port.toString()}=====`));

Answer 1

In the case of Koa, the methods to work with cookies are ctx.cookies.get and ctx.cookies.set. Thus, the lines should be changed to:
// neither cookie is present in EditThisCookie
ctx.cookies.set("buyUsed_shopName", shop, cookieOptions);
ctx.cookies.set("buyUsed_generalToken", accessToken, cookieOptions);

Answer 2

It works when setting, "secureProxy: true"
ctx.cookies.set('jwt', token, { httpOnly: true, secure: true, sameSite: "none", secureProxy: true });