Create IAM User through Console

Create IAM user with S3 Permissions i.e. go to Identity & Access Management (IAM) → Users → Click Add User

Username: e.g. s34jira

Access Type: Programmatic access

Set permissions: Click Attach existing policies directly → Choose Policy (AmazonS3FullAccess)

Click Create user.

That's it, take the note of Access Key ID & Secret Access keys.