Problems with Kidplan are often solved with deleting app data.
iPhone:
- Open the settings of the phone.
- Go to In general -> iPhone Storage -> Kidplan.
- Here you get two options: Remove app/Delete app — tap Delete app.
- Once that is done, Kidplan must be reinstalled from the App Store.
Android:
- Open the settings of the phone.
- Go to Settings -> Apps -> Kidplan -> Storage.
- Press on Clear Data/Clear Storage
- Open and log in to the app again.