I am currently publishing an application that uses WebView, I am currently publishing an application that uses WebView, but I am having trouble with data in LocalStorage sometimes disappearing. The website displayed in WebView is made with PHP, By writing the following code in JavaScript, When WKWebView is opened, localStorage is saved and retrieved. window.localStorage.setItem('isAlreadyAgree', true); window.localStorage.getItem('isAlreadyAgree'); The problem is that sometimes this getItem does not get the data. ・This is not reproducible and does not always occur when some process is performed. ・Is it possible that the storage of the application is cleared due to distribution using MDM? ・Is it possible to store too much data in UserDefault, which would cause the LocalStorage space to be overwhelmed and disappear? I would appreciate any hints you can give me. Thank you in advance.

This time, when I transferred the app to another company (AppTransfer), the push notification did not fly after that. It doesn't go away even after restarting the app, and it seems that no new tokens have been issued. (I don't know if this is due to Firebase or Apple) The AuthKey seems to be correct because the device that newly installed the app has received the notification. Firebase is used for push notifications, and the replacement of the AuthKey of the new company account has been completed. Firebase is returning a "Not Registered" response, probably an APNs response "Unregistered". So, the question is, (1) Will all tokens become invalid after transferring the app? (2) Will tokens that have become Unregistered be revived? Is there anything we can do after replacing the certificate? (3) If this event is not due to AppTransfer, I would like some other advice that we should investigate. Thank you for reading this far.