Why aren't my selected TOC and Index showing in Output

RH10 for Webhelp output

I only have 1 TOC which has entries, and 1 Index which was auto-generated with content.  They are both named and both marked as "Default" - but no matter which way I select them in the Webhelp settings for Content<default>, they aren't coming up in the generated output.

What setting am I missing please?  This is a simple task, so not quite sure how I'm getting it SO wrong.. in fact, it's so simple, I can't find another question regarding this issue.

see my image below for details:

Thanks.