Merge pull request #288239 from dlepow/patch-446819

[APIM] Update validate-jwt-policy.md

Author: prmerger-automator[bot]

articles/api-management/validate-jwt-policy.md

@@ -85,7 +85,7 @@ The `validate-jwt` policy enforces existence and validity of a supported JSON we
 | Element             | Description                                                                                                                                                                                                                                                                                                                                           | Required |
 | ------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------- |
 | openid-config       |Add one or more of these elements to specify a compliant OpenID configuration endpoint URL from which signing keys and issuer can be obtained.<br/><br/>Configuration including the JSON Web Key Set (JWKS) is pulled from the endpoint every 1 hour and cached. If the token being validated references a validation key (using `kid` claim) that is missing in cached configuration, or if retrieval fails, API Management pulls from the endpoint at most once per 5 min. These intervals are subject to change without notice.                                                                                                                                              <br/><br/>The response should be according to specs as defined at URL: `https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderMetadata`. <br/><br/>For Microsoft Entra ID use the OpenID Connect [metadata endpoint](../active-directory/develop/v2-protocols-oidc.md#find-your-apps-openid-configuration-document-uri) configured in your app registration such as:<br/>- v2 `https://login.microsoftonline.com/{tenant-name}/v2.0/.well-known/openid-configuration`<br/>- v2 Multi-Tenant ` https://login.microsoftonline.com/organizations/v2.0/.well-known/openid-configuration`<br/>- v1 `https://login.microsoftonline.com/{tenant-name}/.well-known/openid-configuration` <br/>- Customer tenant (preview) `https://{tenant-name}.ciamlogin.com/{tenant-id}/v2.0/.well-known/openid-configuration` <br/><br/> Substituting your directory tenant name or ID, for example `contoso.onmicrosoft.com`, for `{tenant-name}`.                                                                                                                                                                                            | No       |
-| issuer-signing-keys | A list of Base64-encoded security keys, in [`key`](#key-attributes) subelements, used to validate signed tokens. If multiple security keys are present, then each key is tried until either all are exhausted (in which case validation fails) or one succeeds (useful for token rollover). <br/><br/>Optionally specify a key by using the `id` attribute to match a `kid` claim. To validate a token signed with an asymmetric key, optionally specify the public key using a `certificate-id` attribute with value set to the identifier of a certificate uploaded to API Management, or the RSA modulus `n` and exponent `e` pair of the signing key in Base64url-encoded format.               | No       |
+| issuer-signing-keys | A list of Base64-encoded security keys, in [`key`](#key-attributes) subelements, used to validate signed tokens. If multiple security keys are present, then each key is tried until either all are exhausted (in which case validation fails) or one succeeds (useful for token rollover). <br/><br/>Optionally, specify a key by using the `id` attribute to match the token's `kid` claim. To validate a token signed with an asymmetric key, optionally specify the public key using a `certificate-id` attribute with value set to the identifier of a certificate uploaded to API Management, or the RSA modulus `n` and exponent `e` pair of the signing key in Base64url-encoded format.               | No       |
 | decryption-keys     | A list of Base64-encoded keys, in [`key`](#key-attributes) subelements, used to decrypt the tokens. If multiple security keys are present, then each key is tried until either all keys are exhausted (in which case validation fails) or a key succeeds.<br/><br/> To decrypt a token encrypted with an asymmetric key, optionally specify the public key using a `certificate-id` attribute with value set to the identifier of a certificate uploaded to API Management.         | No       |
 | audiences           | A list of acceptable audience claims, in `audience` subelements, that can be present on the token. If multiple audience values are present, then each value is tried until either all are exhausted (in which case validation fails) or until one succeeds. At least one audience must be specified.                                                                     | No       |
 | issuers             | A list of acceptable principals, in `issuer` subelements, that issued the token. If multiple issuer values are present, then each value is tried until either all are exhausted (in which case validation fails) or until one succeeds.                                                                                                                                         | No       |
@@ -94,7 +94,7 @@ The `validate-jwt` policy enforces existence and validity of a supported JSON we
 ### key attributes
 | Attribute                            | Description                                                                                                                                                                                                                                                                                                                                                                                                                                            | Required                                                                         | Default                                                                           |
 | ------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------------------------------------------- | --------------------------------------------------------------------------------- |
-| id  | (Issuer signing key only) String. Identifier used to match `kid` claim presented in JWT.  | No | N/A |
+| id  | (Issuer signing key only) String. Identifier used to match `kid` claim presented in JWT. If no keys match the claim, API Management will attempt each specified key. [Learn more about the `kid` claim in the RFC](https://www.rfc-editor.org/rfc/rfc7515#section-4.1.4). | No | N/A |
 | certificate-id  | Identifier of a certificate entity [uploaded](/rest/api/apimanagement/apimanagementrest/azure-api-management-rest-api-certificate-entity#Add) to API Management, used to specify the public key to verify a token signed with an asymmetric key.   | No | N/A |
 | n | (Issuer signing key only) Modulus of the public key used to verify the issuer of a token signed with an asymmetric key. Must be specified with the value of the exponent `e`. Policy expressions aren't allowed. | No | N/A|
 | e | (Issuer signing key only) Exponent of the public key used to verify the issuer of a token signed with an asymmetric key. Must be specified with the value of the modulus `n`. Policy expressions aren't allowed. | No | N/A|