FIPS endpoint treated as normal

[grizzly-monkey]

export S3CP_ENDPOINT=s3-fips.us-east-1.amazonaws.com  

s3ls znslrscpjlmujcxe:prefix/

Ignoring ffi-1.9.10 because its extensions are not built. Try: gem pristine ffi --version 1.9.10
Ignoring unf_ext-0.0.7.6 because its extensions are not built. Try: gem pristine unf_ext --version 0.0.7.6
s3ls [AWS::S3::Errors::AuthorizationHeaderMalformed] The authorization header is malformed; the region 'fips.us-east-1' is wrong; expecting 'us-east-1'