azure-cli: Webapp vnet-integration complains it is missing a delegation that exists

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Describe the bug

Command Name az webapp vnet-integration add

Errors:

(SubnetMissingRequiredDelegation) Subnet /subscriptions/XXXX/resourceGroups/myrg/providers/Microsoft.Network/virtualNetworks/VNET858634624/subnets/Subnet858634624 requires any of the following delegation(s) [Microsoft.DBforPostgreSQL/flexibleServers] to reference service association link /subscriptions/XXXX/resourceGroups/myrg/providers/Microsoft.Network/virtualNetworks/VNET858634624/subnets/Subnet858634624/serviceAssociationLinks/Subnet858634624-service-association-link.

To Reproduce:

Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

Was trying to follow this tutorial: https://docs.microsoft.com/en-us/azure/postgresql/flexible-server/tutorial-django-app-service-postgres?tabs=clone

Once I got to the vnet-integration add step, I got this error. I ran vnet subnet update to add the delegation, though I thought the webapp up command did this for me. The subnet does in fact show the flexibleServers delegation on the subnet, yet this command always fails.

When I try to set the vnet integration via portal, the VNET doesn’t even show up, so I’m not sure if there is a bug or the service has changed or I’m just doing something wrong.

Expected Behavior

This should work?

Environment Summary

Windows-10-10.0.19041-SP0
Python 3.6.8
Installer: MSI

azure-cli 2.19.1

Additional Context