Mac Catalina restrictions appear to be the issue which where app launch checks were relaxed for a bit then made more aggressive very recently. We added an issue on the app project site to look into whether the app or just .net core or both need a macOS notice fix but there's a work around discussed here https://www.cultofmac.com/672576/cant-launch-your-apps-on-ma...

Affects .Net Core 2.1, 3.0, 3.1 -not app specific but workaround exists as mentioned and is tracked here https://github.com/microsoft/ApplicationInspector/issues/123

Yep. Oddly, if you click Cancel on every dialog, it does successfully run. But that's a complete dealbreaker.

Webex's godawful browser plugin has the same issue.

I ended up having to put in 50 exceptions one by one over the course of half an hour. Just about the worst.