Provisioning storage accounts is sometimes very slow

I have noticed that sometimes provisioning storage accounts is very slow. Example:

https://dev.azure.com/azure-sdk/internal/_build/results?buildId=2211220&view=logs&j=6645e21d-96b8-5699-8b67-da8d67fe3d82&t=61ded3a0-8afa-5eb1-9668-cc90a8e869e9

It has been repeating `Checking deployment status` for over 30 minutes now, but will usually succeed eventually.

I assume this is a service issue actually completing the deployment, rather than a client issue in our deployment script. But it would be nice to understand what causes this, and see if our deployment script could print more information about why the deployment is taking so long (if the service exposes this information).