@olivierlambert Is there an option for HVM? if yes? what is this ?option

Hello Everyone,
I am new here and I have encountered some issues with my VM's
I start them and they get halted within a minute.

I do not know what to do about that but once I check my Xen Ochestra Web platform I can see this notification.

You are not registered. Your XOA may not be up to date. Click here to create an account. Click here to register and update your XOA.

There is also that information on XOA check.
Please assist me on how I should solve this issue so that I can make the next step