Hi @xray ,
there is a command since passbolt version 4.0 that will enable an admin to generate a recovery token, for himself or any other user:
su -s /bin/bash -c "/usr/share/php/passbolt/bin/cake passbolt recover_user -h" www-data
This command was developed exactly for the case where emails cannot be momentarily sent. It will generate a link to an account recovery.
Note however that the user for which the recovery is being requested needs to be active. Therefore it must have at least once in the past received an registration email.