HI @Eduards
There's really no licensing for Azure Sentinel itself. Instead, make sure your licensing for the services that contain the data you want to connect to Azure Sentinel is licensed appropriately. For example, to export sign-in data from Azure AD, you need an Azure AD P1 or P2 license. So, at minimum, you would want Microsoft 365 E3 which includes P1.
information:https://azure.microsoft.com/en-us/pricing/details/azure-sentinel/
if my answer is helpful please accept my answer
Thanks & Regards,
Sarat chandra