Hello Riya,
The technology running(WebSQL) an offline PWA is not supported anymore by chromium(Chrome, IE, Edge etc.).
You can request an extension of support by google, to support WebSQL for a longer period of time, but in the end it will be abolished. Mendix is currently searching for another technology that will support PWA offline for the future.
more information here:
https://www.mendix.com/blog/websql-removal-and-how-it-affects-your-mendix-pwas/
https://developer.chrome.com/blog/deprecating-web-sql
If you still want to continue with building an PWA offline and want to test the offline profile then you can install an older version of chromium to test your application
https://vikyd.github.io/download-chromium-history-version/#/
Hope this helps
Good luck
Before October 31, 2023