If you are having login issues, please try following steps:
iPhone
1. Launch the Settings app.
2. Go to General -> iPhone Storage-> Kidplan.
3. Choose Delete app.
4. Re-download the Kidplan app from the App Store.
Android
1. Open the phone settings.
2. Go to Apps -> Kidplan -> Storage.
3. Tap Clear data.
4. Launch the app and log in.
Update app
If this doesn’t resolve your issue, please contact IT-support.