If you're in NSW, S119 of the Strata Schemes Management Act (1996) requires Lessors or their Managing Agents to provide the Owners Corporation (O/C) with details with regard to Tenants; specifically the Tenant's name, the date that the Lease commenced, and the name / contact details for the Managing Agent
The rationale is that in the circumstances you describe, the O/C can contact the Managing Agent, and I suspect that individual Tenants are not compelled to provide any of their personal contact details.