MDADM RAID1 of boot devices not working

I am at my wits end trying to set up RAID 1 for my OS devices. I feel like I have tried everything but I always get some sort of failure back. Here's what I have done so far that has gotten me the furthest:

Both devices:
2GB /boot (yes it's big but I really don't care)
42GB /
12GB swap

That is done on both devices (side note: setting the boot flag never works, it always remains in the off position)
Next, I go to configure software RAID and I set RAID 1, 2 disks, 0 spares and choose the partitions accordingly. Once finished, I have my 3 RAID devices, my first one I set to /boot, second is / and third is swap. I get down to the point where it fails to install GRUB on the second disk. I have also tried setting the 2GB volume I have to reserved BIOS boot and either setting the RAID device to /boot or leaving it alone and it still fails with installing GRUB. I have absolutely no idea how to get this working and no other solution online has worked for me so far