invalidPixKey

Olá tudo bem? Obtive essa mensagem no Log do PIX, e n?o entendi o problema:

2021-05-22T13:29:10+00:00 INFO Response status: 400
2021-05-22T13:29:10+00:00 INFO Response received: stdClass Object
(
    [timestamp] => 2021-05-22T10:29:10.640-03:00
    [status] => 400
    [error] => Bad Request
    [details] => Array
        (
            [0] => stdClass Object
                (
                    [field] => key
                    [message] => {invalidPixKey}
                    [errorCode] => 439999
                )

        )

    [path] => /pix/qrcodes/dynamic
)