The Wallbox integration requests a serial number, user, and password (from the Wallbox portal). When unlocking the EVSE, the credentials are used to unlock the unit.
However, anyone with more than one EV can create multiple accounts to allow separate sessions, with their respective charging statistics, and so on. Sessions are associated with the credentials used to unlock the EVSE.
Currently, the EVSE is always unlocked by the same user (the one informed during the configuration), making it only useful to one member of the family.
One quick way around that would be simply adding the same EVSE through the Wallbox integration again in HA, same serial number but with the other user or users. However, if I try that, the following message is displayed: Wallbox - Device is already configured.
Please allow users to configure the same device (same serial number) when combined with a different user.