Getting the error message below from the Studio:
InternalErrorMessage : Error: creating virtual machine failed. Exception=Microsoft.Rest.Azure.CloudException: Operation results in exceeding quota limits of Core. Maximum allowed: 30, Current in use: 30, Additional requested: 2.
Most of the time when provisioning failure occurs due to quota limits, it is either Cores, NICs or Storage Accounts quota issue. So make sure you have sufficient cores, NICs and Storage Accounts to provision the VDAs.
Please contact Microsoft support to increase the quota for your subscription, once the requested quota is provisioned by Microsoft retry the MCS catalog creation, it will be successful.