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My version is desktop.  I’ve never used the online version.  Maybe there is some other way to create an Additional Information Explanation Statement form in the online version?  I’m guessing the Feds just want Line A explained, and TT’s auto-fill doesn’t work, but attaching an explanation to Form 2210 does work, regardless of how the Explanation is triggered (in my case, triggered via Line B).  That’s my theory, anyway.