Is Cognito pool user sub attribute globally unique?

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I'd like to know whether the sub attribute is globally unique across all user pools. Thanks

asked a year ago1043 views
2 Answers
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I tried in past with common sub and it didn't allow me to do so , i can say sub is a globally unique identifier, across pools . Basically when creating a user , Cognito will assign a generated unique IDs (the sub attribute). This attribute cannot be changed and in case you import users from another pool/backup it will change. Just on side-note sub risks data loss and can make it difficult to migrate or recover a userpool. Since sub is globally unique, any restored user data will have new sub values. It will mean re-keying your app database with the new sub keys, whereas if you had used username you could restore your pool as expected.

answered a year ago
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Sub is globally unique in the whole Cognito User Pool ecosystem.

AWS
answered a year ago

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