Sandbox | Bearer token UNAUTHORIZED

Ao criar um novo pedido, utilizando o bearer token padrão, é retornada a mensagem abaixo:

{"error_messages":[{"code":"UNAUTHORIZED","description":"Invalid credential. Review AUTHORIZATION header"}]}

Os dados do código são:
Request request = new Request.Builder()
.url("https://sandbox.api.pagseguro.com/orders")
.post(RequestBody.create(json.toString().getBytes()))
.addHeader("Accept", "application/json")
.addHeader("Content-Type", "application/json")
.addHeader("Authorization", "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAr+ZqgD892U9/HXsa7XqBZUayPquAfh9xx4iwUbTSUAvTlmiXFQNTp0Bvt/5vK2FhMj39qSv1zi2OuBjvW38q1E374nzx6NNBL5JosV0+SDINTlCG0cmigHuBOyWzYmjgca+mtQu4WczCaApNaSuVqgb8u7Bd9GCOL4YJotvV5+81frlSwQXralhwRzGhj/A57CGPgGKiuPT+AOGmykIGEZsSD9RKkyoKIoc0OS8CPIzdBOtTQCIwrLn2FxI83Clcg55W8gkFSOS6rWNbG5qFZWMll6yl02HtunalHmUlRUL66YeGXdMDC2PuRcmZbGO5a/2tbVppW6mfSWG3NPRpgwIDAQAB")
.build();