I have been happily using iodéOS for a while (starting with 6.6 and now on 6.9). I found today that Android Auto would not connect. It worked yesterday.
I found that there was an recent google update to AA (dated 25 October). I applied the update via the AA package on Aurora Store and all is well.
I know there are threads on Aurora Store not update, not notifying, etc. I just wanted to post my experience so you would know to try doing the update before getting into something deeper (and more difficult).