Why isn't Kapacitor getting traffic from other databases?

We are trying to get Kapacitor added to our InfluxDB instance running in AWS using terraform. When we run kapacitor stats ingress we only data for the kapacitor database, not _internal, and not any of our user created databases. We checked to make sure the subscriptions show up in InfluxDB, and they seem correct. We are looking for more tips about how to debug this issue. Are there certain ports that need to be opened up? If the subscriptions are failing somehow, where would we see this in the logs?

I have Kapacitor working fine on my dev machine, but we are struggling to get it working in EC2. Thanks for any help you can give.