When using Ember Simple Auth is it possible to tell the difference between a token expiring and the user pressing logout

I've turned off refreshtokens as we currently do not use them.

app/authenticators/oauth2.js

export default OAuth2PasswordGrant.extend({
  serverTokenEndpoint: ENV.APP.harrierServerTokenEndPoint,
  refreshAccessTokens: false,
  makeRequest: function(url, data) {
  ...

After 12 hours our users token expires and they are correctly taken to the login route.

My end goal is to display a message on the login route is they came there because of token expiry, i.e.

{{if fromExpire 'Your session expired, please login again' ''}}

I'm happy to populate fromExpire property from a url query param or otherwise. The step I'm missing is how to get Ember Simple Auth to tell the login route it is coming from token expiry, as opposed to a first time user or the user having logged themselves out.