Your questions about SoFi Hong Kong are answered here

On the Hong Kong market you can trade equities, exchange traded funds (ETFs), callable bull & bear contracts (CBBC) and warrants. On the U.S. market you can trade equities and exchange traded funds (ETFs). We do not support any Over the Counter (OTC) instruments. Please contact us if you want to handle the unlisted instrument in your SoFi Hong Kong account.