@浩明 島田 Yes, it is possible to take advantage of Defender for Servers’ JIT capabilities in Azure Virtual Machine Scale Set uniform mode. However, you cannot set JIT on uniform VMSS but you can set JIT on Flex. To set the JIT function in uniform mode, you need to enable the “Just-In-Time access” feature in the Azure Security Center. Once enabled, you can configure JIT policies for your scale set instances, which allows you to control the time window and the scope of the access for your VMs.
If you have any questions, let me know in the comments.