403 Forbidden Error when Configuring mTLS Authentication Flow

Knowledge Solutions
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Overview

A 403 Forbidden Error is thrown when configuring mTLS with the Management API endpoint. After following the steps to configure mTLS, the error looks something like this:

{
    "statusCode": 403,
    "error": "Forbidden",
    "message": "Please upgrade your subscription to use mtls.",
    "errorCode": "feature_not_enabled"
}

Solution

As mTLS is a feature of the AISE (Advanced Identity Security Entitlement) SKU, it is not part of the Enterprise package but an extra addon. The HRI feature (containing JWE/JAR/PAR/RAR/mTLS etc) is currently in Early Access, and customers should reach out to Auth0 Support to enable this feature.