Can I apply for placement shares?

At this point in time Interactive Brokers Hong Kong Limited is only supporting subscription applications to the Hong Kong Public Offer Shares of IPOs on the HKEX market's Mainboard.

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Why is Hong Kong not an option under country of residency?
When can I make an application for an IPO?
Can I make a white or yellow form paper application?
Can I apply for shares through both the Public Offer and Placement Offer Tranches?