We're investigating problems with configuration editor.
Update Nov 19, 2020 07:00 UTC - Configuration editor is broken across all regions. We're working on a fix that should be ready shortly. Sorry for inconvenience. Next update in 30 minutes.
Update Nov 19, 2020 07:19 UTC - Change causing the issue has been rolled back and we're in a process of verification that the issue is resolved. Next update in 30 minutes.
Update Nov 19, 2020 07:28 UTC - We verified that the change causing the issue is rolled back on all regions and the configuration editor is working normally. If you're still experiencing issues with the editor, please contact support individually using support button in your project.