Problem
Jira integration is not able to reach on-prem Jira servers due to firewall rules.
Solution
The Jira integration app lives in our ECS cluster, in our VPC.
The integration is a fully managed service from AWS, meaning there is no single IP from SecurityScorecard which we could offer to put into a whitelist.
Amazon does publish a list of their public IPs, but not only is the list is really long, it also is being used by all customers on AWS - thus whitelisting all of the IPs might not be desired. For reference AWS IP ranges can be found here: https://docs.aws.amazon.com/vpc/latest/userguide/aws-ip-ranges.html
At this time it will be necessary to make the Jira site host public in order for this integration to work.