Trouble Activating Ultimate Performance Plan on My Surface Laptop

Hi everyone,
I’m trying to enable the Ultimate Performance power plan on my Surface device. I’ve already used the command powercfg -duplicatescheme e9a42b02-d5df-448d-aa00-03f14749eb61, and it shows up in my system. However, when I try to activate it using powercfg /setactive [GUID], I get an “Invalid Parameters” error—even though the GUID matches exactly what was listed under powercfg /list.

My current active plan is “High performance” (custom-made). Has anyone else encountered this issue on a Surface laptop? Is this plan blocked or incompatible with certain Surface models, or am I missing a step?

Would appreciate any insights or tips!

Thank you so much for your attention and participation.