I probably don't know THE answer but this is what I did:
1. Import your HTML into SIGIL
2. Highlight your chapter headers and select the H1, H2 etc...
This will create a good working epub with a TOC and THEN inport into Calibre and convert the epub to mobi.
Good luck, I think I spent more time with formatting issues than I did with the actual writing of my first book.
But it works.
TL
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