Workbench, a lesson library repository and creation tool, was deprecated in December 2020. You can no longer use the Workbench Education webpage to create, assign, or complete lessons.
You can still access files and lesson content you downloaded before the site was deprecated, which are now in your personal files. However, you cannot access content on the Workbench site.
For those that are looking for a similar coding tool, check out SAM Studio, which has similar functionality to the Workbench programming canvas.