My code says it is no longer valid

Every eSIM code (the QR code, the one-tap link and the activation code) installs exactly once. When your phone says the code is no longer valid, or that the eSIM cannot be added, the code has almost always been used already, often by the same phone a few minutes earlier.

Check whether the eSIM is already installed

1. 1iPhone: open Settings → Cellular. A new line with your plan name and no phone number means the eSIM is installed.
2. 2Android: open Settings → Network & internet → SIMs (Samsung: Settings → Connections → SIM manager) and look for the new eSIM.
3. 3If it is there, you are done. Do not scan the code again. Turn the line on and switch Data Roaming on when you arrive, see the setup guide.

It can take a few minutes for the install to show in your account and in the app, so a line that is in Settings but not yet in your account is normal.