Science and technology innovation board fund can't be bought, probably because the fund is in a closed period. After successful fund raising, there will be a closed period to suspend subscription and redemption. The closure period is usually 1~3 months, and the longest is no more than 3 months. After the closure period, you can trade normally.

Secondly, many science and technology innovation board funds are closed-end funds, that is, funds are closed-end, and subscriptions are stopped during operation. Investors can consult relevant fund companies for details.