Is there any update on the issue? I still want to reference the user pool using the ARN dynamically.
Something that caught me out on this – Cognito Identity Pools cannot have hyphens in the pool name (unlike user pools and many other named elements).
I was getting a regex error when trying to deploy:
1 validation error detected: Value 'XXXXX; at ‘identityPoolName’ failed to satisfy constraint: Member must satisfy regular expression pattern: [\w ]+ (Service: AmazonCognitoIdentity; Status Code: 400;
Removed the hyphens from the name and it deployed without issue: