DestinationUser, the user must create a new user account. See AdminLinkProviderForUser.ProviderName must match the value specified when creating an IdP for the pool. ProviderName value must be Cognito and the ProviderAttributeName must be Cognito_Subject. The ProviderAttributeValue must be the name that is used in the user pool for the user.ProviderAttributeName must always be Cognito_Subject for social IdPs. The ProviderAttributeValue must always be the exact subject that was used when the user was originally linked as a source user.ProviderAttributeName and ProviderAttributeValue must be the same values that were used for the SourceUser when the identities were originally linked using AdminLinkProviderForUser call. (If the linking was done with ProviderAttributeName set to Cognito_Subject, the same applies here). However, if the user has already signed in, the ProviderAttributeName must be Cognito_Subject and ProviderAttributeValue must be the subject of the SAML assertion.curl --location --request POST '/' \
--header 'X-Amz-Target;' \
--header 'Content-Type: application/json' \
--data-raw '{
"UserPoolId": "string",
"User": {
"ProviderName": "string",
"ProviderAttributeName": "string",
"ProviderAttributeValue": "string"
}
}'{}