Ok, you have no skills in coding, but have you at least done what @ChrisWard and @Patryk_F have already suggested you ?
I mean: have you enabled the location sensor on your Android 11 device, since you say that in the older version (Android < 11) the app works ? Please be aware that you shall enable also the "fine location", if not already set by default on your device featuring the Android 11.
Are there any "permission error" pop-ups shown (or any error message) ?
For example another user had a similar problem that has been solved by @Chris:
Any detail that you can tell us could be the key to solve the issue.
Best wishes.