The Shared User functionality does not allow for changing user codes or adding users. Only the owner account can do that. There are two scenarios here:
1- Long term tenant. We need a way to either hand off the owner account to a long term tenant so the owner can not spy on them and the tenant can control the system.
2- Short term rental managed by a company. We need to be able to add a second account with the same rights as the owner account so it can add and change codes as needed. A Shared User cannot do that.