vercel preview domain alias

I’m trying to follow this guide to add an alias to my GitHub CI workflow:

https://vercel.com/guides/how-to-alias-a-preview-deployment-using-the-cli

But I always get an error that the deployment ID cannot be found. I get the same error when trying to run the same command locally against the preview URL.

Anyone else faced this/know how to achieve this?
Vercel Documentation
Learn how to use the Vercel CLI to automatically alias a URL to a preview deployment.
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