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I am having a difficult time understanding which specific certificate to request from the UK, as there are several

  • A1
  • E101
  • Certificate of Continuing Liability

All of these pertain to when someone from the UK is leaving to work elsewhere. I can't find a single description in any form/pdf of a "certificate of coverage" that I would get from the UK to show the US stating that I am in the UK and do not owe Social Security to the US.