Person B can run the unmodified AGPL licensed software without even accepting the license. This is also the case with any GPL software, explicitly.
If Person A under sec 5 made the necessary notification updates, they conveyed a compliant covered work to Person B. So neither is in violation.
That's maybe surprising. But if A and B aren't mutually at arms length, we're back to mens rea; if they are, then A's version is likely available separately anyway, so it's fine.
