Hello MichaelPitsi
As per the official Microsoft article: https://learn.microsoft.com/en-us/azure/defender-for-cloud/deploy-vulnerability-assessment-vm
Defender for Cloud includes vulnerability scanning for your machines at no extra cost. You don't need a Qualys license or even a Qualys account - everything's handled seamlessly inside Defender for Cloud. This page provides details of this scanner and instructions for how to deploy it.
If you have doubts about pricing or planning, I would recommend you to get in touch with an Azure Sales Specialist to contact you: https://azure.microsoft.com/en-gb/pricing/contact/#contact-sales
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