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Who is your guest?
Are they an authorized user on your Venture X?
If so, each Authorized User can get a Priority Pass account.
I’m not exactly sure how the Chase single visit is accounted for across single accounts, but you might be able to get both people in if you each show up with a Priority Pass card.
You would probably definitely both get in if you use a Priority Pass from Amex and your Authorized User uses a Priority Pass from Venture X.
You said something about your Venture X not arriving yet, so maybe this is too close timing to work for you.