The incident has been resolved by the service provider.
Users are now able to submit cases through Apigee's Support Portal.
Note that any attempts to submit support cases between 2021-05-11 22:10:21 UTC and 2021-05-12 00:55:00 UTC may have failed. If you have attempted to submit cases during this period, please log into the Apigee Support Portal and confirm that your cases are appearing as expected.