After updating your Samsung Android device, your itsme app may have been deactivated, and when attempting to reactivate it, you may encounter an error with code 009-3100.
You can avoid this error by first uninstalling the itsme app and then reinstalling it from the Play Store.
You can reactivate your account on the one hand via your bank (BNPPF, Belfius, KBC, CBC, ING, Hello Bank or Fintro) or with your eID card.