Why is the 'shopify theme dev' command leading to a 404 page?

[mgrand]

Hello, I'm developing a theme for our webstore, and recently the link, which the command `shopify theme dev` brings up, leads me to a 404 page.  It's the same procedure I successfully used until ~2 weeks ago, any idea what could have happened?

There is the thing that I use GitPod, where global NPM installs are not preserved, so I have to run `npm install -g @Shopify/theme @Shopify/dev` everytime I fire up the instance, so maybe the Shopify servers detected some suspicious behaviour because the request comes from a fresh install every time?