Increase App Service Worker Count
With-in Azure it is possible to configure or miss-configure App Service Plan scaling so that the Plan can scale but the App Service is limited to a single worker meaning that althoug it's plan can scale out the app never will.
This can be fixed by running the following powershell.
$appSrervice= Get-AzWebApp -ResourceGroupName $ResourceGroup -Name $webapp $appSrervice.SiteConfig.NumberOfWorkers = 2 Set-AzWebApp $appSrervice
Note: The above example increases the workers to 2 but this can be altered to your needs. This number will always be limited to the total number of nodes available via the sale rules and/or the plan's max nodes.