Exceptions are not shown on sentry.io

I have hosted my c# application on Amazon light sail server.
But when any exceptions occur in the system, it is not shown on issues under https://sentry.io

So it seems that it is not able to send exception info to the sentry server.
So what could be the problem? On the server, I have kept 443 port open.

Is there anything like logs to see on Amazon light sail server to figure out why exception info is not passed to the sentry server?