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I think it depends entirely on what the cards utilization is (the one you're an AU on). If it's high, it's not going to... if it's low... so the answer would be yes it does affect it, but whether or not it improves it is only known to you and the primary account holder.
Utilization will be calculated based on all accounts including AU. So you have to do the math.
ok, the Citi shows on one CRA so far, small bump in that particular FAKO due to the CL. But there is a big balance so ...... it could be better lol
It shows their account open date btw, Feb 2010