Following Apple’s trend, many iPad keyboards do NOT feature F1~F12 keys, and their “Fn” keys do NOT translate to Windows’ “Fn” key.
Essentially, this means Fn+Number or Global+Number don’t work as intended on many brands of iPad Keyboards. We cannot input F1~F12 with these keyboards at all.
I wish Remote Desktop app in the future can provide an option to bind custom key combinations to register F1~F12 keys.