First, you can query directory synchronisation status of any Azure AD tenant. This cannot be prevented, but keeping your synchronisation healthy keeps at least error messages away from others.
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Second, the full name of the technical contact can be queried from any Azure AD tenant. This information is given when the tenant was created, and therefore is probably Global Admin.
The name is not shown in any admin portal, so you need contact MS support to change that.
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The functionality to access this information will be included in the next #AADInternals release later this month.
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