If I have multiple accounts will I receive market data in all?

Each username requires its own market data subscription. Linked accounts which are accessible through a single login can share live market data.

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I have just opened my account. Why can't I see market data?
Can I see live data quotes in my paper account before I fund my live account?
Can multiple users on the same account share the same market data subscription?
Why was my account double charged market data fees?