One of the other knowledgeable posters may return shortly with some specifics (and I need to refrain from commenting on actual foreign tax forms and systems, as that’s out of my area). But I can say that the SSA-1099 box 6 field you’re seeing in TurboTax is only for amounts that have been withheld and remitted specifically to the U.S. Treasury, and definitely not for amounts withheld by a foreign government for its own treasury.
Actual foreign withholding normally would be either refunded or not within the context of their system, with a possible “Foreign Tax Credit” here (as JohnB5677 wrote) for what the U.S. resident ends up paying there on double-taxed income, after the dust clears. (You may already be on top of this, calums_mom, but I thought I’d throw it out there just in case!)
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