Can't install Linux alongside Windows

So I am attempting to install Manjaro with the KDE-Plasma desktop and am failing every time I try, it says installation failed, I tried on the boot SSD I have Windows 11 installed on and the massive HDD, neither work…

I get this error.

The bootloader could not be installed. The installation command

grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=Manjaro --force
returned error code 1.

Works with both win10/11, ext4 and btrfs

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I suspect your system has been booted in BIOS mode - thus the efivars has not been loader - and the result is bootloader installation failing.

Up and running now, I actually fount out by fumbling around through Google links.
The issue is when CSM is enabled it removes support for Above 4G encoding and the use of SAM or resizable bar.

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