@443 Apologies for late response here! Could you confirm if this an Azure policy that you have enabled?
Share private link, by design, is from our VNet, ie Microsoft internal, to the customer's, so it is expected to be in 2 different subscription.
If you have a policy auditing or preventing this external from search, it would need to be relaxed for some resources, or those resource should be provisioning in a scope where the policy doesn't apply.
Let us know.