You can continue using your RPO credentials to manage the subscription of a number which is already registered to the service. Otherwise, you can use any other available access method to authenticate yourself, in case you already linked the number to your digital identity.

Enter using RPO credentials

SPID is an Italian authentication method that allows to access, with a single digital identity, the online services of the Public Administration and of the registered private entities. If you already have a digital identity, you can access using the credentials of your provider. If you don't have a digital identity yet, you can request it to one of the available Identity providers.