It varies from person to person. They have a proprietary method for determining if and how this is factored into your score. I'm an AU on 6 cards. From lots of reading on this board and abroad I haven't been able to figure it out myself. 1 of my AU accounts absolutly factors into my FICO. The others I'm unsure of. Best wishes
Either the account "counts" or it doesn't. You're saying it doesn't and I'm not sure there's anything that can be done about that. Is the account significantly older than your oldest account? AU accounts are usually added for credit age depth, or AoOA as much more more than AAoA. Where does the utilization percentage sit on this account and how does it look on your other accounts? It's possible depending on those different utilizations that you could do a test with the AU card balance wise to determine if it indeed is being ignored by the algorithm. Age of accounts may be a bit more difficult to test, as you're just going by what fluff front-end summary software is telling you.
There's a pretty easy test that leverages the fact that when all your cards report a zero balance you get a 15-20 point penalty.
So pay all cards to zero (including AU cards). After all cards appear at $0 on your reports, pull your FICO 8 scores. Then allow the AU card to report a small positive balance. If FICO 8 is counting it, your score will rise 15-20 points. If there is no boost, it means FICO 8 is ignoring the card and still thinks all your cards are at $0.
Oldest account is 44 years. This AU is 26, next oldest is 24
I'm not sure there would be any benefit at all of having a 26 year old AU account if your oldest account is 44 years and next oldest [non-AU] is 24 years old.