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For everyone else having this issue, shout out to u/FieldofBliss24 for finding the solution:
This issue is for Windows 11
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Hello Reddit,
I restarted 5 times already and still can't enable this thing, does anyone know what's going on?
I tried to enable it through the registry as well, but it doesn't work.
I searched on Google, Bing, Yahoo, and Baidu, and no one else seems to be having the same issue as me, and I have no idea how it just suddenly decided to disable itself.
You can reach this setting from Windows Security -> Device Security -> Core Isolation Details -> Local Security Authority Protection
I am running a Ryzen 5800x with RTX2080 on a Gigabyte X570i motherboard, I hope this information helps.