Symptoms
I'm going to create a Trial-Only hosting plan with Plesk VPS and make sure that the trial license for Plesk is installed at the time of provisioning.
Is it possible to order a trial license key through OBAS?
Cause
It's by design that trials are not available to customers KA accounts. That is why a trial license key cannot be ordered through OBAS.
Resolution
Request your sales representative for a trial license key.