Hi TAP_DEV •,
Welcome to Microsoft Q&A forum and thanks for using Azure Services.
As I understand, you could not create Azure Database for MariaDB using Rest API with any other SKU apart from "Basic"
The documentation for that is here:
https://learn.microsoft.com/en-us/rest/api/mariadb/databases/create-or-update?tabs=HTTP
In the meantime, I am trying to reproduce this case and will get back to you.
Thanks