Thank you for your answers
Yes I rebooted to test it and only have the option to boot into linux.
The same errors appear in the os-prober section when I run grub-mkconfig...
I might try a different bootloader as I read that Grub can have errors with dual booting.
sygoo i quickly reformatted the partition as a linux filesystem and reran OS-Prober which delivered the same errors.
I will retry installing ASAP
i SHOULD ALSO MENTION, I'm a total
so if the answer is 'You're doing it wrong' I can live with that lol