Simplytest.me can't load versions for the commercetools module

Problem / Motivation

When I try to launch the sandbox with the "commercetools" Drupal module https://www.drupal.org/project/commercetools → - the Simplytest.me service can't load the available versions for some reason.

This is because the https://simplytest.me/simplytest/project/commercetools/versions endpoint shows an error:
The website encountered an unexpected error. Try again later.

Trying to do this already for a week, so seems this is not a temporary issue. Could you please look into this?