[ZT] Add doc links to MCP troubleshooting (#26841)

* Update mcp-portals.mdx

* Apply suggestions from code review

Author: ranbel

src/content/docs/cloudflare-one/access-controls/ai-controls/mcp-portals.mdx

@@ -177,12 +177,12 @@ Portal logs allow you to monitor user activity through an MCP server portal. You
 
 ## Troubleshooting
 
-### After authenticating to the Portal, my user receives the error "No allowed servers available, check your Zero Trust Policies"
+### After authenticating to the portal, my user receives the error `No allowed servers available, check your Zero Trust Policies`.
 
-1. A Portal and server must both have an attached policy. Ensure that any assigned servers to the Portal have their own associated policy.
-2. The server's admin authentication may be expired. Check that the server's status in the AI Controls dashboard is **Ready**.
+1. An MCP portal and server must both have an attached Access policy. Ensure that all MCP servers assigned to the portal have their own associated policy.
+2. The server's admin authentication may be expired. Check that the [server's status](#server-status) is **Ready**. If the status shows an error, [reauthenticate the server](#reauthenticate-the-mcp-server).
 
-### The portal URL will not prompt for authentication when it is added to an MCP client
+### The portal URL does not prompt for authentication when it is added to an MCP client.
 
-1. Verify that the Portal has an assigned policy.
-2. Verify that the Portal URL does not have any applied Workers, Page Rules, Custom Hostname definitions, or any other configuration that may interfere with its ability to connect to the MCP client.
+1. Verify that the portal has an assigned Access policy.
+2. Verify that the portal URL does not have any applied [Workers](/workers/configuration/routing/custom-domains/), [Page Rules](/rules/page-rules/manage/), [custom hostname](/cloudflare-for-platforms/cloudflare-for-saas/domain-support/) definitions, or any other configuration that may interfere with its ability to connect to the MCP client.