I've been having this error when logging in my subscription in Acquia Cloud:
Error: php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution (0)
I think it is a PHP problem, not sure. I dont know how to troubleshoot it.
I want to migrate my local drupal site in the Acquia Cloud for my project.
If you were logging in from a saved url then seems like your url has expired. Please try again directly from the acquia website with a fresh url.