Your tenant giving access rights to someone else gives only access rights, nothing more. Depending on the situation, it isn't even necessary that you give gate code to the person seeking access. It is the tenant's responsibility to inform you if access rights for someone else are terminated.

These additional access people have tried changing codes, etc., but they have no right, as your tenant is the only one with these rights.

Attornies can give you more info, but it is the safe way to give no information to anyone but the tenant.

Astro (Bob)