We will be removing the ability to use the .devportal.apigee.com and .apiportal.apigee.com from all Drupal-based Portal sites hosted on Pantheon, effective May 30th, 2018 at 5:00pm Pacific Standard Time. This will affect all environments. Note that custom domains are not impacted. Nor are domains created for your APIs.
In the January 2018 release a redirect was introduced which would forward all requests from .devportal.apigee.com to .devportal.apigee.io. We will now be continuing with the our domain migration by removing the use of the *.devportal.apigee.com domain entirely.
The .devportal.apigee.io domains will continue to function and are available for pre-production activities. Customers are required to implement their own custom domains upon launch of their programs, more details are available here: https://docs.apigee.com/api-platform/publish/drupal/working-pantheon#custom-domain
If you have concerns for your site, please contact Apigee Support and we will validate your configuration and address any concerns.