Does OKTA Validate Signature on SAML Authentication Requests

By default OKTA is not supporting request signing, confirmed this through the request created and traced via SAML tracer.

SIgnature and SigAlg parameters in Parameters of SAML tracer is not seen

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I found an article which is older. Wanted to know Does OKTA Validate Signature on SAML Authentication Requests?

If it is supported how to enable request signing?