When server virtualization was new, many software vendors were reluctant about supporting their software when it was running in a virtual machine. Some vendors were only willing to give support if the customer was able to prove the issue was not related to virtualization. In some cases, they even had to perform a virtual to physical conversion of their workload as evidence. Oracle was one of those companies that clearly stated that in rare cases the customer had to perform such a conversion.
Software vendors nowadays are less reserved in supporting their software when it runs on cloud platforms and Microsoft Azure in particular. Microsoft has put in a lot of effort to make sure vendors support Azure. Many large software vendors support Azure, for example, SAP, Citrix, and Oracle. Oracle announced that it will fully support customers running their software on Microsoft Azure and Hyper-V.