diff --git a/app/[lang]/(live)/(protected)/logout/route.ts b/app/[lang]/(live)/(protected)/logout/route.ts
index 336613db0..003602043 100644
--- a/app/[lang]/(live)/(protected)/logout/route.ts
+++ b/app/[lang]/(live)/(protected)/logout/route.ts
@@ -1,32 +1,120 @@
+import { createActionURL } from "@auth/core"
+import { headers as nextHeaders } from "next/headers"
 import { NextRequest, NextResponse } from "next/server"
 import { AuthError } from "next-auth"
 
+import { Lang } from "@/constants/languages"
+import { env } from "@/env/server"
+import { serverClient } from "@/lib/trpc/server"
 import { badRequest } from "@/server/errors/next"
 
 import { signOut } from "@/auth"
 
-export async function GET(request: NextRequest) {
-  const returnUrl = request.headers.get("x-returnurl")
+export async function GET(
+  request: NextRequest,
+  context: { params: { lang: Lang } }
+) {
+  let redirectHeaders: Headers | undefined = undefined
+  let redirectTo: string
 
-  // If all else fails, always redirect to startpage
-  const redirectTo =
-    returnUrl ||
-    request.nextUrl.searchParams.get("redirectTo") ||
-    "/"
+  const returnUrl = request.headers.get("x-returnurl")
+  if (returnUrl) {
+    // Seamless logout request from Current web
+    redirectTo = returnUrl
+  } else {
+    // Normal logout request from New web
+    redirectTo =
+      request.cookies.get("redirectTo")?.value || // Cookie gets set by authRequired middleware
+      request.headers.get("x-redirect-to") ||
+      request.nextUrl.searchParams.get("redirectTo") ||
+      request.headers.get("Referer") ||
+      "/"
+    console.log(redirectTo)
+    // If above fails, always redirect to startpage
+    if (!redirectTo) {
+      const proto = request.headers.get("x-forwarded-proto") ?? "http"
+      const host =
+        request.headers.get("x-forwarded-host") ??
+        request.headers.get("host") ??
+        env.URL
+      redirectTo = `${proto}://${host}/`
+      console.log({ logout_fallback: redirectTo })
+    }
+    // Clean up cookie from authRequired middleware
+    redirectHeaders = new Headers()
+    redirectHeaders.append(
+      "set-cookie",
+      "redirectTo=; Expires=Thu, 01 Jan 1970 00:00:00 UTC; Path=/; HttpOnly; SameSite=Lax"
+    )
+  }
 
   try {
+    // Initiate the seamless logout flow
+    const invalidateResponse = await serverClient().user.invalidateSessions()
+
+    let redirectUrlValue
+    console.log(context.params.lang)
+    switch (context.params.lang) {
+      case Lang.da:
+        redirectUrlValue = env.SEAMLESS_LOGOUT_DA
+        break
+      case Lang.de:
+        redirectUrlValue = env.SEAMLESS_LOGOUT_DE
+        break
+      case Lang.en:
+        redirectUrlValue = env.SEAMLESS_LOGOUT_EN
+        break
+      case Lang.fi:
+        redirectUrlValue = env.SEAMLESS_LOGOUT_FI
+        break
+      case Lang.no:
+        redirectUrlValue = env.SEAMLESS_LOGOUT_NO
+        break
+      case Lang.sv:
+        redirectUrlValue = env.SEAMLESS_LOGOUT_SV
+        break
+    }
+
+    const redirectUrl = new URL(redirectUrlValue)
+    redirectUrl.searchParams.set("returnurl", redirectTo)
+    redirectTo = redirectUrl.toString()
+    console.log(redirectUrl, redirectTo)
+  } catch (e) {
+    console.error(
+      "Unable to create URL for seamless logout, proceeding without it."
+    )
+    console.error(e)
+  }
+  try {
+    console.log({ logout_AUTH_URL: process.env.AUTH_URL })
+    console.log({ logout_NEXTAUTH_URL: process.env.NEXTAUTH_URL })
+    console.log({ logout_env: process.env })
+
     /**
      * Passing `redirect: false` to `signOut` will return a result object
      * instead of automatically redirecting inside of `signOut`.
      * https://github.com/nextauthjs/next-auth/blob/3c035ec/packages/next-auth/src/lib/actions.ts#L104
      */
-    const obj = await signOut({
+    const headers = new Headers(nextHeaders())
+    const signOutURL = createActionURL(
+      "signout",
+      // @ts-expect-error `x-forwarded-proto` is not nullable, next.js sets it by default
+      headers.get("x-forwarded-proto"),
+      headers,
+      process.env
+    )
+
+    console.log({ logout_signInURL: signOutURL })
+
+    const redirectUrl = await signOut({
       redirectTo,
       redirect: false,
     })
 
-    if (obj) {
-      return NextResponse.redirect(obj.redirect)
+    if (redirectUrl) {
+      return NextResponse.redirect(redirectUrl, {
+        headers: redirectHeaders,
+      })
     }
   } catch (error) {
     if (error instanceof AuthError) {
diff --git a/auth.ts b/auth.ts
index 59e85c82d..778824aea 100644
--- a/auth.ts
+++ b/auth.ts
@@ -152,6 +152,11 @@ export const config = {
   //     console.log(arguments)
   //     console.log("#### END - SIGNIN EVENT ARGS ######")
   //   },
+  // async signOut() {
+  //   console.log("#### SIGNOUT EVENT ARGS ######")
+  //   console.log(arguments)
+  //   console.log("#### END - SIGNOUT EVENT ARGS ######")
+  // },
   //   async session() {
   //     console.log("#### SESSION EVENT ARGS ######")
   //     console.log(arguments)