Integrating chirpstack server with AWS

I am trying to integrate chirpstack server with AWS console. Previously when I used V3, it worked properly but now i’m using V4. It is not working properly. I gave all the requirements like access key, secret access key, AWS SNS topic arn, and also region i mentioned in chirpstack integretion part, and i’m using email protocol subscription. I confirmed the subscription but still i can’t able to see the data. Previously when i used V3, data that i am ending can be seen in my emails. But now i’m not getting any emails.
How to resolve this issue??