Sorry about that the message got cut: Don’t worry about that, maybe is because your backend and frontend are on different domains (Mobile apps like capacitor work with http://localhost and your backend is on your website which has another domain).
Can you post some screenshots about your setup?
Also would be nice if you post your code (you can format the code by https://community.wappler.io/t/how-to-format-code-in-your-posts/19828)
Storing cookies is very tricky, but we were working with Milo and got it running without issues on both devices.