If you don't know what your Webservice User is, follow these steps:
Access SES Hospedajes through the following link.
Log into your account with the digital certificate or Cl@ve identification method by clicking on:
Once inside, click the "Access" button within the "Communication Service" or "Webservice User" box.
You will find your Webservice User with the following structure: NIF+WS or, in the case of a company, CIF+WS. Remember that all Webservice Users end in WS.
NOTE: If the Communication Services section does not appear, go to "My registered data" and check the option for "Sending communications via web service."
In this way, you will have re-enabled the Web Service, and you will receive an email with the two details: Webservice User and Webservice Password.