SSL Virtual Server to Azure blob storage account

We have a requirement to use F5 as the frontend for Azure storage accounts hosting blob file containers. The SFTP Virtual servers work without issue however the https ones do not. I have tried both standard and performance layer 4 virtual servers but see connection errors when I try to connect though the F5.

When we do this with App Services we have to use custom domains and upload the certificate but storage accounts don't have that option. 

Has anyone been able to get this working that can give me some pointers on what I might be doing wrong? 

Thanks,