Have you tried this app for the token? I thought Tesla had shut down the Owner API. However this app was updated as recently as a month ago, so maybe it still works.
I couldn't find the app in the android play store but I did try the iOS one on my MacBook - it didn't work. No error message; it just didn't return a value.
I tried 2 or 3 web-based Tesla token generators; the instructions were to log on to the Tesla site and continue until it returned a 404 error and then copy the URL back into the generator site where the token would be extracted. This process failed on the Tesla site with an error, but not a 404 error. I copied the URL back per the directions but no token was found. I tried this on my Pixel phone using Chrome and on my MacBook using Chrome and Safari, all with the same result.
Just tried this on my iPad. It doesn’t show you the token but if you click “Tap to copy to clipboard”, there’s a really long letter/number combination that shows up. Maybe that’s the token? It shows a validity of 8 hours 
In the iOS app were you able to log in using your Tesla login? It authenticates against your Tesla login and 2-factor authentication.
It's been a day or two so I don't remember exactly, but i don't think I got anything after logging in and performing the TFA -I think it just returned back to the app. Maybe the app doesn't work on a Mac.
Or maybe something was fixed since I tried. I'll try again later this evening.
Thanks for the help!
There is a little toggle that you have to flip to see the token information and also shows you the button (text) to copy the token. Otherwise it looks like it just came back to the same screen and did nothing.
Here's the message I get instead of the 404 error that's expected when using the web-based token generators:
Something went wrong. Try again later
The 'redirect_uri' supplied is not registered for this 'client_id'.
It’s on the NEXT screen - after you have logged in with your Tesla account. From the screenshot you attached, it appears that you have not logged in as yet.
But I did log in and got the window asking whether I wanted an email or text for the TFA code, received and entered the code, and was returned right back to the same screen.
I don't think I would have gotten to the TFA process if I'd entered the wrong password, but I verified it by logging using is to log into the Tesla app on my Android tablet.
Hmm - must be something different with MacOS vs iOS. It's doing the same thing on my MacBook Air as well. Works fine on iPad and iPhone. Sorry - not sure there is much more I can help with 
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Thanks for trying!
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Sorry, I do not know anything about the Server side of connecting with the Tesla stuff. I only have ever worked on the local-only side here.
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