The Visual Studio Codespaces portal was fully retired, and all remaining data was deleted. Major Differences and Improvements
The migration followed a phased decommissioning of the Azure-based service: Visual Studio Codespaces is moving to GitHub
Because environments were not automatically transferred, developers had to manually move their work: The Visual Studio Codespaces portal was fully retired,
The service became read-only; users could no longer create new plans or codespaces. Visual Studio Codespaces is moving to GitHub