Problems doing a COPY from AWS S3 to AWS Redshift

I'm admittedly a neophyte when it comes to the AWS ecosystem so please be patient :)

I'm attempting to do a common bulk load of a csv file located in a bucket on S3 to a table on Redshift.  Here is the copy command:

COPY tmp_target_table (column1,column2,column3,column4)
from 's3://reference-data/subfolder1/new_data.csv'
credentials 'aws_access_key_id=<MyAccessKey>;aws_secret_access_key=<MySecretAccessKey>' 
delimiter ',';

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But I get the following error message:

ERROR:  S3ServiceException:The AWS Access Key Id you provided does not exist in our records.,Status 403,Error InvalidAccessKeyId...

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I've double checked my keys to make sure it wasn't a copy and paste problem.  I also utilize the same keys to access S3 directly through CyberDuck and log into the AWS CLI, both with no problem.  Has anyone had a similar problem?

Thanks,
Glen