There are a few steps to this;
1. creating an azure subscription (presumably your org already has this, but if not, then this is something you have to first set up)
once you have the subscription, the service principle gives access to that environment so that we can create and manage the Horizon Cloud environment.
to do this ;
2. Create an application registration in Azure Active Directory
3. Create a Key (secret) for this application registration
4. Assign this application registration to a Contributor IAM role for the subscription
5. Make sure that the necessary resource providers have been configured
I suggest you take a look at the Getting Started Guide - it is referenced from the overview in the community site and on the vmware documentation site. see VMware Horizon Cloud (on Microsoft Azure) Direct link to the getting started guide is: https://docs.vmware.com/en/VMware-Horizon-Cloud-Service/services/hzncloud-microsoftazure-14-getstarted.pdf
The getting started guide walks you through all of these steps (with pictures). The process should take no more than 5minutes to complete.
Once completed, this then has 4 values (subscriptionID, DirectoryID, Application ID, Application Secret) and these values can be keyed into the Horizon Cloud Service administrative console when on boarding your Azure node.
NOTE: whilst you are in the Azure portal, I recommend you take a look at the quotas and limits, and make sure that you have the Av2, Dv2, FSeries vm sizes with sufficient capacity for the region(s) in which you wish to deploy your node. (you can get this from Subscriptions --> Quotas and Limits) (see https://www.vmware.com/content/dam/digitalmarketing/vmware/en/images/products/horizon-cloud-virtual-desktops/vmware-hori… for details.
hope this helps and do let me know how you get on,
thanks peter. i hadn't spotted the getting started guide,
that has helped me, and you were right - took around 5 minutes to complete. Simple!