Add 404 error for Application Proxy to troubleshooting section

admin-guide/installation/entra-id/application-proxy.md

@@ -142,4 +142,4 @@ Sorry, but we’re having trouble with signing you in. <br/><br/> AADSTS50105: Y
 BadGateway: This corporate app can't be accessed. <br/><br/> Connection to the server failed. For more details, check the Application Proxy Connector Event Log for reported errors. | This could happen if the application proxy internal URL is accidentally configured with `https` instead of `http`
 GatewayTimeout: The corporate app cannot be accessed / the service is unable to reach the connector / NoActiveConnector | <li>Make sure that the Application Proxy connector is properly installed and registered with your Entra ID tenant</li><li>Check the Application Proxy connector Event Log for reported errors</li><li> Check the network settings to make sure any inactive connectors can reach the service and become active again</li>
 GatewayTimeout: The corporate app cannot be accessed<br/><br/>Next Steps<br/><br/>This application is associated with a connector group that contains no connectors. Make sure to add connectors to this group for the application to be available. | This gets reported in Pozi as an `EmptyConnectorGroup` error. Solution: install the connector by following the instructions in section 1. above. For more information, see the relevant section on the [Microft Entra Id site](https://learn.microsoft.com/en-au/entra/identity/app-proxy/application-proxy-connectivity-no-working-connector)
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+This page can’t be found. No web page was found for the web address: `https://poziserver-<entra-application-client-name>.msappproxy.net` HTTP ERROR 404 | If the top level URL to the Application Proxy gives this error, it could be that the Private Network connectors are disabled in Entra ID. Visit https://entra.microsoft.com/#view/Microsoft_AAD_IAM/AppProxyOverviewBlade and check if the Private Network is currently disabled for your tenant. Re-enable if needed and try again.