diff --git a/plugins/rms.openwebrx.guard/index.js b/plugins/rms.openwebrx.guard/index.js
index edac88e..9b2692e 100644
--- a/plugins/rms.openwebrx.guard/index.js
+++ b/plugins/rms.openwebrx.guard/index.js
@@ -58,10 +58,12 @@ function issueAccess(ctx, tickets, input) {
     expiresAtMs
   });
   const openWebRxPath = String(ctx.getSetting("upstreamPath", ctx.env.OPENWEBRX_PATH || "/openwebrx/")).trim() || "/openwebrx/";
+  const separator = openWebRxPath.includes("?") ? "&" : "?";
+  const iframeUrl = `${openWebRxPath}${separator}ticket=${encodeURIComponent(ticket)}`;
   return {
     ticket,
     expiresAt: new Date(expiresAtMs).toISOString(),
-    iframeUrl: openWebRxPath,
+    iframeUrl,
     userId
   };
 }
diff --git a/public/app.js b/public/app.js
index 8169de3..9120b23 100644
--- a/public/app.js
+++ b/public/app.js
@@ -1617,8 +1617,9 @@ async function openOpenWebRxSession() {
   try {
     const result = await requestOpenWebRxSessionWithRetry();
     const session = result && result.session ? result.session : null;
-    state.openWebRx.sessionUrl = session && session.iframeUrl ? session.iframeUrl : "";
-    state.openWebRx.sessionTicket = session && session.ticket ? String(session.ticket) : "";
+    const sessionTicket = session && session.ticket ? String(session.ticket) : "";
+    state.openWebRx.sessionUrl = buildOpenWebRxSessionUrl(session && session.iframeUrl ? session.iframeUrl : "", sessionTicket);
+    state.openWebRx.sessionTicket = sessionTicket;
     state.openWebRx.expiresAt = session && session.expiresAt ? session.expiresAt : null;
     syncOpenWebRxTicketCookie(state.openWebRx.sessionTicket, state.openWebRx.expiresAt);
     renderOpenWebRxSessionAccess();
@@ -1641,12 +1642,13 @@ async function openOpenWebRxExternal() {
   try {
     const result = await requestOpenWebRxSessionWithRetry();
     const session = result && result.session ? result.session : null;
-    const sessionUrl = session && session.iframeUrl ? String(session.iframeUrl) : "";
+    const sessionTicket = session && session.ticket ? String(session.ticket) : "";
+    const sessionUrl = buildOpenWebRxSessionUrl(session && session.iframeUrl ? String(session.iframeUrl) : "", sessionTicket);
     if (!sessionUrl) {
       throw new Error("OpenWebRX Session konnte nicht erstellt werden");
     }
     state.openWebRx.sessionUrl = sessionUrl;
-    state.openWebRx.sessionTicket = session && session.ticket ? String(session.ticket) : "";
+    state.openWebRx.sessionTicket = sessionTicket;
     state.openWebRx.expiresAt = session && session.expiresAt ? session.expiresAt : null;
     syncOpenWebRxTicketCookie(state.openWebRx.sessionTicket, state.openWebRx.expiresAt);
     renderOpenWebRxSessionAccess();
@@ -1658,6 +1660,22 @@ async function openOpenWebRxExternal() {
   }
 }
 
+function buildOpenWebRxSessionUrl(rawUrl, ticket) {
+  const baseUrl = String(rawUrl || "").trim();
+  const normalizedTicket = String(ticket || "").trim();
+  if (!baseUrl) {
+    return "";
+  }
+  if (!normalizedTicket) {
+    return baseUrl;
+  }
+  if (/[?&]ticket=/.test(baseUrl)) {
+    return baseUrl;
+  }
+  const separator = baseUrl.includes("?") ? "&" : "?";
+  return `${baseUrl}${separator}ticket=${encodeURIComponent(normalizedTicket)}`;
+}
+
 async function requestOpenWebRxSessionWithRetry() {
   const attempts = [0, 700, 1400, 2200];
   let lastError = null;
diff --git a/test/auth-methods.integration.test.js b/test/auth-methods.integration.test.js
index 3d97ab5..7def689 100644
--- a/test/auth-methods.integration.test.js
+++ b/test/auth-methods.integration.test.js
@@ -1667,6 +1667,7 @@ test("openwebrx session is owner-bound and release disables tx first", async (t)
   });
   assert.equal(session.ok, true);
   assert.ok(session.session.ticket);
+  assert.match(String(session.session.iframeUrl || ""), /[?&]ticket=/);
 
   const authOk = await fetch(`${baseUrl}/v1/openwebrx/authorize?ticket=${encodeURIComponent(session.session.ticket)}`);
   assert.equal(authOk.status, 200);