Here’s how to make Vercel Preview URLs publicly accessible so anyone can access them.
By default, Vercel Preview URLs are only accessible to users who are logged into Vercel.
Since I couldn’t find this information in Japanese, I checked the Vercel Project Settings and found the setting under Project Settings > Deployment Protection > Vercel Authentication.
Access a URL like https://vercel.com/your-org/your-project/settings/deployment-protection and set Vercel Authentication to “Disabled” to make your Preview URLs publicly accessible.
For more details, please refer to Vercel Authentication.
That’s all from the Gemba.