There doesn't appear to be any content on Microsoft Learn for the Azure Analysis service.
The documentation contains a set of tutorials: https://learn.microsoft.com/en-us/azure/analysis-services/analysis-services-create-sample-model and quickstart guides: https://learn.microsoft.com/en-us/azure/analysis-services/analysis-services-create-server
Here is a set of videos on Azure analysis services: https://www.youtube.com/watch?v=psFPYCKTpV0&list=PLzUhuc9SHO5e134ZAAo71yD77IFp23FG-