The Register [theregister.co.uk]:
There are rumblings that Azure is having capacity issues once again, with customers in the UK South region reporting problems getting new VMs provisioned.
...
In case there was any doubt as to what the problem was, the message went on: "To ensure that all customers can access the services they need, we are working through approving quota requests as we bring additional capacity online."According to the update, the capacity constraints apply to the A, BS, Dv2, DSv2, Dv3 and DSv3 series machines in the UK South region. A-series VMs are typically used for development and testing, B-series are similiar, but are geared to short bursts of high CPU utilisation. The D-series are heftier beasts, aimed at running enterprise applications. The 'S' moniker indicates support for SSDs.
Customers are feeling blue about Azure.