Serverless AWS-secrets Manger local development cannot retrieve secrets

Hey guys, I am new to serverless and would like your help to figure out what I am doing wrong.
In my local development after using sls offline --config cusom.yml i am unable to retrieve secrets. After a bit of debugging, found out that the credentials is null.

However, when i invoke it separately using pure js aws-sdk (not with serverless) I am able to retrieve the secrets and the credentials is prepopulated. Please let me know if you have any suggestions on why this is not working with sls offline