Getting a no 'Access-Control-Allow-Origin' when using AWS auth

Getting a no 'Access-Control-Allow-Origin' when using AWS auth - but works without AWS auth

Access to fetch at 'https://some-amazon-aws-url.com/data/search' from
origin 'https://my-local-url.com:9898' has been blocked by CORS 
policy: Response to preflight request doesn't pass access control 
check: No 'Access-Control-Allow-Origin' header is present on the 
requested resource. If an opaque response serves your needs, set the 
request's mode to 'no-cors' to fetch the resource with CORS disabled.

I'm trying to use the aws4fetch library https://github.com/mhart/aws4fetch to include the AWS accessKeyId, secretAccessKey to the authorization header but I get the above error.

Oddly, when I simply use axios to make a request to that resource (without including any of the AWS auth info), I get the expected response (200) but when I try to use the aws4fetch library, I get the above error citing a CORS issue.

When I look at API-Gateway, I see my-local-url in the Access-Control-Allow-Origin list. Not sure why when I try using the including aws-auth info to the header, that cors error appears.

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