If you will receive any complaints that iPhone does not remember the password and ask to enter it every time the app is closed please suggest for the customer:
Update IOs to the newest version! (14 and 15 versions had issues with password remember).
Reinstall APP. When installing the app allows using of cookies and local storage.
Follow the links and check iPhone settings:
https://www.saintlad.com/autofill-passwords-not-working-ios/
https://beebom.com/autofill-passwords-not-working-iphone-ipad-fix/Because our APP uses a browser engine, in the browser (safari, chrome) cookies, password saving, and use of local storage should be allowed.
If the issue persists, please register consultation and provide the exact ios version and phone model.