Android SDK saved access token fails

Here is my code. The issue is coming from the authenticationSuccessful failing after I create a new AndroidAuthSession with the previous access token.

// create the application key token
AppKeyPair appKeyToken = new AppKeyPair("APP Key", "APP Secret");
AndroidAuthSession session = new AndroidAuthSession(appKeyToken);

// try to get the session token from the shared preferences
String accessToken = getDropboxToken();

// check if the session token was retrieved
if (accessToken == null)
 {
 // if no token, then have the user sign in
 dropboxSession = new DropboxAPI<>(session);
 dropboxSession.getSession().startOAuth2Authentication(context);
 }
else
 {
 // session token already available
 dropboxSession = new DropboxAPI<>(new AndroidAuthSession(appKeyToken,accessToken));

 // authenticate Dropbox login
 authenticateDropboxLogin();
 }


private String getDropboxToken()
   {
      // get the shared preferences area for the token
      SharedPreferences sessionTokenRecord = context.getSharedPreferences("token", Context.MODE_PRIVATE);

      // get the token key
      String sessionToken = sessionTokenRecord.getString("accessToken", null);

      return sessionToken;
   }


private void saveDropboxToken(String accessToken)
   {
      // create a new shared preferences area for the token
      SharedPreferences.Editor tokenRecordEditor = context.getSharedPreferences("token", Context.MODE_PRIVATE).edit();

      tokenRecordEditor.putString("accessToken", accessToken);

      tokenRecordEditor.commit();
   }


private void authenticateDropboxLogin()
   {
      // check if the authentication was successful
      if (dropboxSession.getSession().authenticationSuccessful())
         {
            // finish the authentication
            try
               {
                  dropboxSession.getSession().finishAuthentication();
                  saveDropboxToken(dropboxSession.getSession().getOAuth2AccessToken());
               }
            catch (IllegalStateException e)
               {
                  showToast("Couldn't authenticate with Dropbox:" + e.getLocalizedMessage());
                  Log.i("Dropbox", "Error authenticating", e);
               }
         }
   }