Yeah same here. Just got my fp6 with e/os preinstalled from fairphone and used the instruction to install How to setup Android Auto with /e/OS?
Same issue you are having
I am having the same issue as well on a Fairphone 5, A15, 3.1.1. It worked fine before on A13, 3.0.4, bur after updating, it all broke. Would love to have this fixed. Tried multiple things, like clearing the cache, re-downloading, restarting, but no luck so far.