Hello @Manu Cohen-Yashar ,
Thanks for the question and using MS Q&A platform.
Currently Azure MariaDB is not supported as a data source in Microsoft Purview and hence you cannot register it.
For a list of supported data sources, file types, and scanning concepts in the Microsoft Purview Data Map please refer to this document: Microsoft Purview Supported data sources and file types
As product team is making continuous efforts to expand the scope of supported data sources, I would suggest you to please log a feature request in IDEAS forum here: https://feedback.azure.com/d365community/forum/82d7bddb-fb24-ec11-b6e6-000d3a4f07b8 and do share the link with me so that I can pass this feedback along with your feature request link to respective product owners. All the feedback share in this forum is actively monitored and reviewed by product teams.
Hope this info helps.
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