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Only the primary account hilder can request CLI. AFAIK
AU's technically piggyback for account age, and credit reporting purposes.I'm fairly certain that if the primary account holder was to ask for a CLI, he/she might take a hard hit but it doesn't affect you.
Others will chime in on this one also.
What card?
Only primary would possibly see a pull, nothing for you, Even some joint accounts do not pull the secondary card holder if added after the initial opening of account.