I just noticed this is using Mono, so I assume this is a Xamarin app, so it's not quite the same as a standard android (java/kotlin based) app. That could be relevant. It turns out mono (the .net runtime used for xamarin stuff) may use it's own certificate store, not the android store, but I could be reading that wrong: [Not a Bug / Installation] Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED · Issue #12406 · mono/mono · GitHub
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