Sending Fluent Bit Logs from On-Premise K8s Cluster to Amazon CloudWatch failed

Question

I have a VM outside of AWS cloud where K8s cluster exists. I am using latest version of Fluent-bit to send logs from the cluster to Amazon CloudWatch. However, I am seeing the below errors in the pod logs.

Note - I have added the access id and secret key as env variables in the FluentBit's DaemonSet and I am able to connect to AWS cloud. Previously I was getting error for shared credentials file. I believe that the token is needed to set as env var.

FluentBit ConfigMap edited with below [OUTPUT] for cloudwatch_logs.

[OUTPUT]
    Name cloudwatch_logs
    Match   *
    region ap-south-1
    log_group_name /<aws/cloudwatch/log-group-name>
    log_stream_prefix from-fluent-bit-
    auto_create_group On