Dear gt-af!
Welcome to the Microsoft Community!
I read your question and appreciate the information you provided about the uppercase "L" key issue you're experiencing in Windows applications for macOS, but I need some additional information to better understand the situation and provide assistance.
Could you please specify which Windows application you're experiencing this issue in? That way I can better determine if it's an application-specific issue or a broader system-wide problem.
Are you experiencing this issue while using Microsoft applications (such as Windows installed via Boot Camp) or while running Windows on macOS using virtual machine software (such as Parallels Desktop, VMware Fusion, or VirtualBox)?
Also, I want to confirm if your keyboard has a Mac mode and a Windows mode. Some keyboards have different modes to accommodate different operating systems. Check your keyboard settings to see if there's an option to switch modes, or try a different keyboard to rule out hardware issues.
Did you also mention that this is a problem that occurs in all applications, or is it only in a specific application? If the latter, please provide the name of the application.
Once you provide this information, I can help you determine the next steps, including how to open an appropriate support ticket. If this is a widespread issue, further investigation may be required and require support from Apple or Microsoft. If the issue is limited to a specific app, you may need to contact the developer of that app.
Please provide the above information so that we can continue to help you resolve this issue. Thank you!
I wish you all the best in the new year 2025~
Best regards,
Yang.Z - MSFT | Microsoft Community Support Specialist