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....just remember that the more AU accounts you add, the less your score represents your own personal risk assessment, and thus the chance that a manual review may result in questioning the value of your score in their decision making.
Assuming VS means Visa, it depends on the bank or issuer of the visa card. Your hubby should ask when adding you as a AU.
For the AMEX card, No. AMEX reports the date AU member became a Authorized User.
It should, they did on all the cards I made my wife an AU on. (VS as well)
Good luck.