I need your help with a mount I just bought

Good morning, I just bought the "Great Ice Mammoth" mount through the sons of Hodir and they let me use the normal mount but when two people want to ride it just doesn't work, only one person can ride and it can go from one seat another, but two people does not allow it. How could you help me with this, since I saved a lot of money for a long time so that it does not work, I appreciate your attention and I hope for a prompt response because your promising something specific but they are not giving it and it was a purchase for a large amount of gold.