If the Routely V1 app is not working on your iPhone 12 despite reinstalling it and receiving the activation code, follow these troubleshooting steps:

1. Check App Permissions
Ensure that the app has the necessary permissions to function. Go to Settings > Privacy > Location Services and ensure Routely V1 has access. You might also want to check other permissions like notifications or background app refresh under Settings > Routely V1 and allow any necessary permissions - learn more.

2. Restart Your Device
A simple restart can clear temporary glitches. Press and hold the side button with one of the volume buttons until the power off slider appears. Slide it to turn off your device, then press and hold the side button again to turn it back on.

3. Switch to Airplane Mode and Back
Some users have reported that toggling airplane mode can help reset connections. Swipe down from the top right corner to open Control Center, tap the airplane icon, wait a few seconds, then tap it again to disable it.

4. Update to the Latest iOS Version
Check if there is an update available for your iPhone. Go to Settings > General > Software Update. Install any available updates, as these can fix bugs that may affect app performance - learn more.

5. Check for App Updates
Ensure that the Routely V1 app is updated to the latest version. Open the App Store, go to the Updates tab, and see if there is an update available for Routely V1.

6. Reinstall Again
Occasionally, an app wields hidden issues that a simple reinstall cannot resolve. Delete the app, restart your phone again, and then download Routely V1 fresh from the App Store.

7. Contact Support
If the problem persists even after trying the above steps, consider reaching out to Routely’s support for further assistance. You can visit their support page for any known issues or additional troubleshooting guidance - learn more.

Following these steps should help in troubleshooting the issues with the Routely V1 app on your iPhone 12. If the app continues to have problems, it might be related to compatibility or server issues that only the app developers can resolve.