A lot of trades will take between 30-40 attempts. Just keep re-trying and count to 35 or so in attempts. You should get him by then. Anything less, be thrilled
Ended up trading for Correa AFTER trading him and it took me 16 attempts, so really not that bad all in all. It's taken me around 30 attempts on past trades before Pujols and Correa
I finally got him today with only a couple hours left in the trade before the players switched. I spent around 300 gold I think but well worth it for him. It was probably the 20th time i would say when he finally accepted
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Good luck