After creating Data Extension I cannot change External Key. Each time I change it and click "Done", refresh page and it's still the same key.

  • If you are sure about not re-using the same external key that you use on another data extension, you might create a support case: help.salesforce.com/… – Selim Sevim Dec 19 '18 at 15:06
  • I tried with unique. – Vlad Shpak Dec 19 '18 at 15:10
  • Are you doing this in Email Studio or in Contact Builder? I have experienced issues when trying to change key in Contact Builder, but succeeded doing it for same DE in Email Studio – Lukas Lunow Dec 20 '18 at 7:53
  • @LukasLunow Contact Builder – Vlad Shpak Dec 20 '18 at 7:54
  • 1
    Try in Email Studio, and see if this solves it – Lukas Lunow Dec 20 '18 at 7:55

I have seen same "behaviour" in Contact Builder myself. Changing External Key for same Data Extension in Email Studio usually works.

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