Can also confirm the behavior described by @arturosanz, after hours of banging my head against it. I was trying to implement an app that monitors the device location and indicates the current state of the permission. This works reasonably well on Chrome, with a few gotchas, but on iOS it's completely unpredictable. Removing or adding the permission while the page is loaded is also flaky. The permission status returned in the query has an 'onchange' handler which is not reliably invoked by Safari.

Same problem, with an updated app. Everything inside TestFlight looks fine. But installation just fails. No idea why.

Same here, not working on latest Safari. Makes PWA such a pain to debug on iOS.

No, these capabilities are not supported by Safari on iOS. Chrome and other browsers are forced to use the same underlying browsing engine (WKWebView) and therefore do not support it either. It would be really great to have this capability in the future... one can hope.