Thanks for getting in touch.
I don't think you need the
yield call before the
send method, but even with it there I do not see a reason why the error would not be sent to Raygun.
We actually log errors in sagas ourselves, so I think that something else is stopping the error from being sent.
Checking that your API key is configured and Crash Reporting is enabled on the page you are testing would be my next recommendations (I'm assuming you already have checked this but it's always good to double check).
Once you've confirmed the above, if you could visit our Contact page and click the "Support" link to send us a message I'll be able to debug the issue further with you.