As advised by the Twitter support team, just copying over my experience to here.
Just started out with Cosmos DB. Running through 'Quick start' for serverless (Core SQL, UK West)
Clicking "Create 'Items' container" on Node.js tab = "Setting offer throughput or autopilot on container is not supported for serverless accounts" in http response
Not sure if you're already aware of this, but as quick start is the first page a new customer is directed to after setting up the resource, it's not a great experience
This isn't a huge issue for me, as I figured out how to configure a container outside of quickstart, but think this might put off less experienced devs.
