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Virtual Key
The virtual key is Teslemetry's public key, installed in your vehicle through the Tesla app. It's required for Fleet Telemetry (live streaming) and signed vehicle commands - Fleet Telemetry's transport is secured with mTLS, while command signing is a separate mechanism that uses the vehicle command protocol; see Command Signing for the difference.
Since nearly all vehicles support the virtual key, nearly all customers need it: if your vehicle supports it, install it as a standard part of setup. Vehicles without virtual-key support are the exception - they still work with Teslemetry at reduced capability, with data by polling instead of streaming and commands unsigned where Tesla permits. See Telemetry for which vehicles those are.
You can install the Teslemetry virtual key by selecting the specific vehicle in the Tesla app, opening the following link on that smartphone, and follow the instructions in the Tesla app:
https://tesla.com/_ak/teslemetry.com
If the Tesla App does not open immediately when you click this link, it has not worked.
Next steps
Accounts with owner permission can install the virtual key remotely, but accounts with driver permissions will have an additional step that requires a physical keycard. The Teslemetry console flags any vehicle missing the virtual key with a No Key badge, and the vehicle's dashboard shows a QR code to install it. Use the Check Again button on that alert to force a refresh once installed.
To learn more about how Teslemetry signs vehicle commands, see Command Signing.
Troubleshooting
If you open the link and your smartphone opens the Tesla website rather than app, the process has not worked. Try open the Tesla app, ensure you have your vehicle showing, then return to this website (not the Tesla one), and click the link again.
Known issues
If your have more than one app called "Tesla" on your phone, the process wont work. You must remove the other Tesla app.
Certain browsers like Samsung Internet may not open apps from web links, Chrome on Android is known to work.