Searching for info on online teaching certification for higher ed

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You're not getting much of a response because there is no single answer to your question.  Every school has different standards and policies.  Your local community college will have different standards than MIT.  Typically, for a tenure-track faculty job you're going to need a PhD or some credential that is roughly equivalent.  Are there exceptions?  Of course, but it's a very competitive market and so minimum qualifications will rarely even get you an interview.  Taking a course to teach online is not a big deal.  They're not hard to find.  If you feel the need to try to impress someone then you can try this:
https://pll.harvard.edu/course/harvard-b...e?delta=11