I get 'undefined' when i get a certificate from the mtls_certificates

I am trying to call/fetch a url and pass along a certificate as described here:
https://developers.cloudflare.com/workers/runtime-apis/bindings/mtls/

I uploaded the certificate to my worker and i already added the following to the wrangler.toml
mtls_certificates = [
{ binding = "MY_CERT", certificate_id = "0805d62bxxxxxcdfdd5d6c" }
]

however the return await environment.MY_CERT.fetch(endpoint_url) not working and when i console out the MY_CERT I get "undefined"
Cloudflare Docs
Configure your Worker to present a client certificate to services that enforce an mTLS connection.
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