Unable to use via Family sharing – Dr. Seuss Treasury Kids Books Review

I purchased a subscription with my account and my kid is unable to use this app on my husband’s ipad also we have family sharing activated. In this app’s page it says it supports family sharing, but it doesn’t. Also couldn’t find a way to reach out to the company for tech support. On the website it only refers to Q&A page for that.
Review by GaleHey on Dr. Seuss Treasury Kids Books.