This most likely needs assistance from support. Check that the Microsoft.Network resource provider is registered:
To register use the steps here: https://learn.microsoft.com/en-us/azure/azure-resource-manager/management/resource-providers-and-types#register-resource-provider-1
If done and issue persists I would recommend reaching out to support for assistance:
https://azure.microsoft.com/en-us/support/create-ticket
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola