diff --git a/src/music_service.ts b/src/music_service.ts
index 6625df0..2411561 100644
--- a/src/music_service.ts
+++ b/src/music_service.ts
@@ -1,6 +1,5 @@
 import axios from "axios";
 import { Md5 } from "ts-md5/dist/md5";
-import { AuthToken } from "./link_codes";
 
 const s = "foobar100";
 const navidrome = process.env["BONOB_NAVIDROME_URL"];
@@ -14,7 +13,7 @@ export function isSuccess(authResult: AuthSuccess | AuthFailure): authResult is
 }
 
 export type AuthSuccess = {
-  authToken: AuthToken
+  authToken: string
   userId: string
   nickname: string  
 }
@@ -29,7 +28,7 @@ export interface MusicService {
 
 export class Navidrome implements MusicService {
   login({ username }: Credentials) {
-    return { authToken: { value: `${username}`, version: "1" }, userId: username, nickname: username }
+    return { authToken: `v1:${username}`, userId: username, nickname: username }
   }
 
   ping = (): Promise<boolean> =>
diff --git a/src/smapi.ts b/src/smapi.ts
index db3d6c0..89c8348 100644
--- a/src/smapi.ts
+++ b/src/smapi.ts
@@ -71,7 +71,7 @@ class SonosSoap {
     if (association) {
       return {
         getDeviceAuthTokenResult: {
-          authToken: association.authToken.value,
+          authToken: association.authToken,
           privateKey: "",
           userInfo: {
             nickname: association.nickname,
diff --git a/tests/in_memory_music_service.ts b/tests/in_memory_music_service.ts
index d7c6d98..abb937f 100644
--- a/tests/in_memory_music_service.ts
+++ b/tests/in_memory_music_service.ts
@@ -15,7 +15,7 @@ export class InMemoryMusicService implements MusicService {
       password != undefined &&
       this.users[username] == password
     ) {
-      return { authToken: { value: "token123", version: "1" }, userId: username, nickname: username };
+      return { authToken: "v1:token123", userId: username, nickname: username };
     } else {
       return { message: `Invalid user:${username}` };
     }
diff --git a/tests/link_codes.test.ts b/tests/link_codes.test.ts
index 5d4df4f..83c967e 100644
--- a/tests/link_codes.test.ts
+++ b/tests/link_codes.test.ts
@@ -18,7 +18,7 @@ describe("InMemoryLinkCodes", () => {
     describe('when token is valid', () => {
       it('should associate the token', () => {
         const linkCode = linkCodes.mint();
-        const association = { authToken: { value: "token123", version: "22" }, nickname: "bob", userId: "1" };
+        const association = { authToken: "token123", nickname: "bob", userId: "1" };
 
         linkCodes.associate(linkCode, association);
 
@@ -29,7 +29,7 @@ describe("InMemoryLinkCodes", () => {
     describe('when token is valid', () => {
       it('should throw an error', () => {
         const invalidLinkCode = "invalidLinkCode";
-        const association = { authToken: { value: "token123", version: "33" }, nickname: "bob", userId: "1" };
+        const association = { authToken: "token456", nickname: "bob", userId: "1" };
 
         expect(() => linkCodes.associate(invalidLinkCode, association)).toThrow(`Invalid linkCode ${invalidLinkCode}`)
       }); 
diff --git a/tests/smapi.test.ts b/tests/smapi.test.ts
index 938cb15..1ce235c 100644
--- a/tests/smapi.test.ts
+++ b/tests/smapi.test.ts
@@ -175,7 +175,7 @@ describe("api", () => {
       describe("when there is a linkCode association", () => {
         it("should return a device auth token", async () => {
           const linkCode = linkCodes.mint();
-          const association = { authToken: { value: "at", version: "66" }, userId: "uid", nickname: "nn" };
+          const association = { authToken: "at", userId: "uid", nickname: "nn" };
           linkCodes.associate(linkCode, association);
   
           const ws = await createClientAsync(`${service.uri}?wsdl`, {
@@ -187,8 +187,8 @@ describe("api", () => {
   
           expect(result[0]).toEqual({
             getDeviceAuthTokenResult: {
-              authToken: association.authToken.value,
-              privateKey: association.authToken.version,
+              authToken: association.authToken,
+              privateKey: "",
               userInfo: {
                 nickname: association.nickname,
                 userIdHashCode: crypto