The Workflows page in the Observability section does not display workflows for custom environments (e.g., staging). Workflows only appear for the default preview and production environments.
Workaround
Navigate to another page in Observability.
Change the environment filter to All environments.
Solution summary: Vercel released a fix for the Observability UI that correctly populates custom environments in the Workflows view. Custom environment workflows are now visible and selectable directly within the Workflows page without needing to toggle global environment filters on separate dashboard pages.