Customers buying their Azure services through an Enterprise Agreement or via the MCA-E have long been eligible for free Azure Standard Support, but Microsoft announce that this offer is coming to an end on 30 June, 2024. After that time, customers will need to purchase one of the paid-for support plans.
Find the announcement here: https://bit.ly/4cASdBh (search for “Azure support”), and details of the available support plans here: https://bit.ly/44i3x1h.