curl --location --request POST '/' \
--header 'X-Amz-Target;' \
--header 'Content-Type: application/json' \
--data-raw '{
"UserPoolId": "string",
"Username": "string"
}'
{
"Username": "string",
"UserAttributes": [],
"UserCreateDate": "string",
"UserLastModifiedDate": "string",
"Enabled": true,
"UserStatus": "UNCONFIRMED",
"MFAOptions": [],
"PreferredMfaSetting": "string",
"UserMFASettingList": []
}