Deploying to new regions not working

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Description

I'm trying to get the AWS Integration working and the initial setup works fine via CFN for the first region , us-east-1 in my case. I'm following https://docs.datadoghq.com/logs/guide/forwarder/?tab=cloudformation
“If you had previously enabled your AWS Integration using the following CloudFormation template from your AWS integration page in Datadog, your account may already be provisioned with a Datadog Lambda Forwarder function if you decided to include it. In that case, you will only need to install the Datadog Lambda in additional AWS regions in your account where you wish to export logs.” So I've manually created a Lambda in a different region, us-west-2, exactly the same as in the first region and added it to the list of ARNs in the AWS Integration config page, enabled API Gateway access/execution logs. but nothing is coming through to DD logs from the second region.

Test invoking the function from the console shows the function's log coming through ok:

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