This is most likely because Microsoft dropped mainstream support for Dynamics AX 2009:
Mainstream support for Dynamics AX 2009 Service Pack 1 (SP1), Dynamics AX 2012, and Dynamics AX 2012 R2 ended on October 9, 2018. Security hotfixes were provided for those three versions through the extended support period, which ended on April 12, 2022. For more information, see Microsoft Lifecycle Policy.
Dynamics AX 2009 Lifecycle
https://learn.microsoft.com/en-us/lifecycle/products/dynamics-ax-2009
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