Not able to deploy ARO cluster since resources not available

Issue

Disclaimer: Links contained herein to an external website(s) are provided for convenience only. Red Hat has not reviewed the links and is not responsible for the content or its availability. The inclusion of any link to an external website does not imply endorsement by Red Hat of the website or their entities, products or services. You agree that Red Hat is not responsible or liable for any loss or expenses that may result due to your use of (or reliance on) the external site or content.

• After following the documentation on how to deploy an ARO cluster an error like this appears in the console:

  $ az aro create
  The template deployment failed with error: 'The resource with id: '/subscriptions/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/resourceGroups/t-ibm-mqcluster/providers/Microsoft.Compute/virtualMachines/t-stb-mqcl1-x5xn8-master-0' failed validation with message: 'The requested size for resource '/subscriptions/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/resourceGroups/t-ibm-mqcluster/providers/Microsoft.Compute/virtualMachines/t-stb-mqcl1-x5xn8-master-0' is currently not available in location '{location}' zones '1' for subscription 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX'. Please try another size or deploy to a different location or zones. See https://aka.ms/azureskunotavailable for details.'.'.','target':null,'details':null,'innererror':null,'additionalInfo':null}