Trying to configure 413 exception redirect

I'm trying to configure my web.config to redirect the 413 statusCode. I've tried many different variations of settings, and nothing seems to be working. The two main variations I've tried are:

<customErrors mode="On" redirectMode="ResponseRewrite" defaultRedirect="/Errors/index.htm"><error statusCode="413" redirect="/Errors/413.htm" /></customErrors>

and

<httpErrors errorMode="Custom"><remove statusCode="413"/><error statusCode="413" path="/Errors/413.htm" responseMode="File"/></httpErrors>

Running on IIS10.

Any help would be appreciated.