Deploying Azure flexible server hangs

Following this page:

https://video2.skills-academy.com/en-us/azure/postgresql/flexible-server/tutorial-webapp-server-vnet

When creating the actual database, the process hangs. It eventually fails after a couple hours with this: The resource write operation failed to complete successfully, because it reached terminal provisioning state 'Failed'.

I've tried a bunch of variations (ie changing regions, sizes, etc), but no luck. I've also deleted the vnet, subnet and private dnszone that previous tries had created, but that makes no difference either.

I can create a db without a vnet successfully though, but of course using a vnet is a requirement in our case.

Any suggestions? Thanks.