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I dont think anybody can answer your question with any degree of certainty
There are three possible situations, they may allow you to be added, they may close the card or simply don't allow you to be added.
I would leave AU account alone and deal with those collections. They are what's holding your scores down.
I would not try to AU with any banks you owe money to.
You have quite a friend, you should not risk anything.
GL!
DON'T WORK FOR CREDIT CARDS ... MAKE CREDIT CARDS WORK FOR YOU!