diff --git a/convex/tickets.ts b/convex/tickets.ts
index 834a4d9..3cc9ce4 100644
--- a/convex/tickets.ts
+++ b/convex/tickets.ts
@@ -1018,10 +1018,23 @@ async function requireTicketChatParticipant(
     return { user: viewer.user, role: normalizedRole, kind: "manager" };
   }
   if (normalizedRole === "COLLABORATOR") {
-    if (String(ticket.requesterId) !== String(viewer.user._id)) {
-      throw new ConvexError("Apenas o solicitante pode conversar neste chamado");
+    // Verificar se e o solicitante
+    if (String(ticket.requesterId) === String(viewer.user._id)) {
+      return { user: viewer.user, role: normalizedRole, kind: "requester" };
     }
-    return { user: viewer.user, role: normalizedRole, kind: "requester" };
+    // Verificar se esta vinculado a maquina do ticket
+    if (ticket.machineId) {
+      const machine = await ctx.db.get(ticket.machineId);
+      if (machine) {
+        const isLinkedToMachine =
+          machine.assignedUserId?.toString() === viewer.user._id.toString() ||
+          machine.linkedUserIds?.some((id) => id.toString() === viewer.user._id.toString());
+        if (isLinkedToMachine) {
+          return { user: viewer.user, role: normalizedRole, kind: "requester" };
+        }
+      }
+    }
+    throw new ConvexError("Apenas o solicitante pode conversar neste chamado");
   }
   throw new ConvexError("Usuário não possui acesso ao chat deste chamado");
 }