Whatever I do Magisk just doesnt install. I patched the boot.img with 7 different versions of magisk, I even downloaded the image posted by someone here, and it just doesnt install.
I'm on 13.0.7.0 SKSEUXM,bootloader unlocked.
my fastboot commands are:
adb reboot bootloader
fastboot --disable-verity --disable-verification flash vbmeta_a vbmeta.img
fastboot --disable-verity --disable-verification flash vbmeta_b vbmeta.img
fastboot flash boot_a magisk_patch.img
fastboot flash boot_b magisk_patch.img
fastboot reboot.
It doesn't install

Can anyone help?
It's my mom's phone and it had root before the MIUI 13 update, so I tried the payload.bin method too but it didnt work.