Deductions & credits

OK, I'm doing that.  About the question "What type of HDHP did <<Name>> have on December 1, 2020?", it says "If <<Name>> had HDHP coverage on December 1, 2020, but failed to be an eligible individual for other reasons, select None.

 

What does it mean by "for other reasons" in the context of that question.  I failed to be eligible 6 months later because I became eligible for Medicare.  My HDHP type was "Family".  Do I select "Family", or "None"?