doAzureParallel is built on top of Azure Batch, which starts with a few quota limitations.
By default, doAzureParallel users are limited to 20 cores in total. (Please refer to the VM Size Table to see how many cores are in the VM size you have selected.)
Our default VM size selection is the "Standard_F2" that has 2 core per VM. With this VM size, users are limited to a 10-node pool.
By default, doAzureParallel users are limited to running 20 foreach loops in Azure at a time. This is because each foreach loops generates a job, of which users are by default limited to 20.
To increase your default quota limitations, please visit this page for instructions.