Hi Dylan,
I'm Ramesh, here to answer your query at the Microsoft Community.
If the "Yes" button is missing in the UAC consent dialog, it means your account has lost its admin privileges, and no other admin accounts exist in the computer.
Fortunately, you can restore admin privileges to your account by logging into the built-in "Administrator" account via Safe mode.
Please try the accepted solution in the following thread.
Administrator Access Disabled? - Microsoft Community:
https://answers.microsoft.com/en-us/windows/for...
I hope that helps. Let me know how it went.