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For Residential users, this is required for all new registrations as they are associated with a particular apartment and need to be authorised as the owner or occupier of that property.
Anyone with the role Property Manager will receive an email notification advising them that there is a new user requiring approval. The Property Manager role is the admin for the whole site, and cannot be narrowed down to individual building(s) at the current time.
You can see our guide on approving or deactivating users here.
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