What the form is looking for is what I mentioned before - it doesn't want you to pay taxes twice. You paid taxes on the amounts that vested in Taiwan in 2021. The amounts that vest in the US in 2023 you haven't been taxed on by Taiwan. So the US wants you to pay all your taxes to them.
IF I'M WRONG and you did pay taxes to Taiwan on any of the amounts that are vesting in the US in 2023 then that is exactly the type of foreign taxes you are supposed to deduct. That is what form 1116 is for. But if you didn't pay taxes anywhere else for the money then the US is expecting you to pay it to them.
@chenm003
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