Hi @Sven Erik Matzen ,
We do not have an official guide, and licensing questions are handled by a separate team (not on Q&A). It is free to reach out to them through the global support numbers, though. https://support.microsoft.com/en-us/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2
https://azure.microsoft.com/en-us/support
The recommendation, though, is to transition to the Microsoft Defender for Servers P1 SKU. https://learn.microsoft.com/en-us/azure/defender-for-cloud/plan-defender-for-servers