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Issues with connecting to Android Auto Wirelessly get message phone is not connected to bluetooth. - Android Auto Community
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AA not working after faulty cockpit control (head) unit replaced. Samsung Galaxy Note 8, Android 9. 2020 Subaru Outback. Worked for 1.5 years. Replacement head unit hardware/software reported exactly the same. Dealer
Why Is Android Auto Not Working? 8 Troubleshooting Fixes
Android Auto bug on Samsung phones appears to have been fixed - SamMobile
Android Auto issue on Samsung phones fixed in July update