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Have to open app to use key

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I screwed up and traded in a 2018 Model S for a 2023. I have several issues, the biggest being that I have to open the Tesla app to get the key to work. I set up the key on my wife's phone and that phone doesn't have the issue. My phone is a Note 20 Ultra 5G. Is there a trick to get it to work?
 
You have to keep the app open to use the phone as a key.
No you don't. Your phone doesn't even have to be unlocked for it to function as PaaK.

Go into your settings though and make sure that whatever data & battery saving settings you can find for the Tesla app are disabled. You don't want any of that junk ending processes behind the scenes. Typically, that's a good thing for apps you're not using but on this app (and similar apps doing important things in the background) you want them free to run 24/7.