I've seen this issue before. It's usually because of that "Match Audience Rules" setting. The analyst has to qualify for Experience B in order to see it through the QA link.
Okay, let me walk through this step-by-step. If the Activity is not live, then the QA link wouldn't show the content for Experience B. And if the Activity is live, the QA link wouldn't show it to avoid impacting the reporting data. I'm leaning towards B as the most likely reason.
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