Your questions about SoFi Hong Kong are answered here

Under certain scenarios, your Fractional Shares Order may not be placed or executed. Please refer to the “Consent – Fractional Order” for more details. Some possible reasons: The stock price is not within 20% of the price indicated in “Your Fractional Order Arrangement” notification email. The order will be automatically canceled by the close of trading. Your Fractional Share Order will only be executed on a US full trading day. All half trading day orders will be carried forward to the next full trading day.