Hi Mas023,
Thank you for sharing the details.
The issue occurred because a Virtual Machine Scale Set (VMSS) resource associated with the deleted Azure Lab was still active in the backend. This dependency prevented the automatic deletion of other related resources such as the Load Balancer, Virtual Network, and Public IP.
After performing a backend cleanup to remove the VMSS, the dependent resources were successfully unblocked, and all remaining resources were deleted from the subscription without any further issues.