EBS Snapshot of root device fails to start on new instance "Instance reachability check failed"

I have a linux server, went to update & upgrade, then on reboot it failed the 2nd check "Instance reachability check failed"

So I started a fresh EC2 linux (Ubuntu) instance and connected to it successfully on launch (i-058b3702fde1abd66) I then replaced the root device with a EBS snapshot of the initial server that failed. I get the same issue "Instance reachability check failed". I've now tried 3 snapshots (going back 3 days) all the same reachability check failed.

System log is below, seems to be some mount issue, so I reconnected root drive to a clean instance and edited /etc/fstab to be:

LABEL=cloudimg-rootfs / ext4 defaults,discard 0 1 LABEL=UEFI /boot/efi vfat umask=0077 0 1

Any ideas what next?

(this concerns me more because I thought my snapshots were my backups, and although I can access the files on the drive, the root drive not booting causes me concerns about my backup strategy)

Tks

[    3.523087] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[    3.532357] x86/mm: Checking user space page tables
[    3.586991] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[    3.594864] Run /init as init process
Loading, please wait...
Starting version 245.4-4ubuntu3.22
[    3.842997] cryptd: max_cpu_qlen set to 1000
[    3.905239] FDC 0 is a S82078B
[    3.943483] AVX2 version of gcm_enc/dec engaged.
[    3.948912] AES CTR mode by8 optimization enabled
[    4.948350] input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input4
Begin: Loading essential drivers ... [    5.326179] raid6: avx2x4   gen() 25672 MB/s
[    5.398181] raid6: avx2x4   xor()  8269 MB/s
[    5.470181] raid6: avx2x2   gen() 25398 MB/s
[    5.542180] raid6: avx2x2   xor() 15182 MB/s
[    5.614183] raid6: avx2x1   gen() 22721 MB/s
[    5.686179] raid6: avx2x1   xor() 12890 MB/s
[    5.754182] raid6: sse2x4   gen() 12825 MB/s
[    5.826180] raid6: sse2x4   xor()  7682 MB/s
[    5.898180] raid6: sse2x2   gen() 13219 MB/s
[    5.970180] raid6: sse2x2   xor()  8518 MB/s
[    6.042180] raid6: sse2x1   gen() 11670 MB/s
[    6.114178] raid6: sse2x1   xor()  7422 MB/s
[    6.118951] raid6: using algorithm avx2x4 gen() 25672 MB/s
[    6.122946] raid6: .... xor() 8269 MB/s, rmw enabled
[    6.127082] raid6: using avx2x2 recovery algorithm
[    6.132753] xor: automatically using best checksumming function   avx       
[    6.138696] async_tx: api initialized (async)
done.
Begin: Running /scripts/init-premount ... done.
Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done.
Begin: Running /scripts/local-premount ... [    6.221155] Btrfs loaded, crc32c=crc32c-intel, zoned=yes, fsverity=yes
Scanning for Btrfs filesystems
done.
Begin: Will now check root file system ... fsck from util-linux 2.34
[/usr/sbin/fsck.ext4 (1) -- /dev/xvda1] fsck.ext4 -a -C0 /dev/xvda1 
cloudimg-rootfs: clean, 239778/1920000 files, 3112153/3931899 blocks
done.
[    6.325413] EXT4-fs (xvda1): Unrecognized mount option "uquota" or missing value
mount: mounting /dev/xvda1 on /root failed: Invalid argument
done.
Begin: Running /scripts/local-bottom ... done.
Begin: Running /scripts/init-bottom ... mount: mounting /dev on /root/dev failed: No such file or directory
mount: mounting /dev on /root/dev failed: No such file or directory
done.
mount: mounting /run on /root/run failed: No such file or directory
BusyBox v1.30.1 (Ubuntu 1:1.30.1-4ubuntu6.4) multi-call binary.

Usage: run-init [-d CAP,CAP...] [-n] [-c CONSOLE_DEV] NEW_ROOT NEW_INIT [ARGS]

Free initramfs and switch to another root fs:
chroot to NEW_ROOT, delete all in /, move NEW_ROOT to /,
execute NEW_INIT. PID must be 1. NEW_ROOT must be a mountpoint.

	-c DEV	Reopen stdio to DEV after switch
	-d CAPS	Drop capabilities
	-n	Dry run
Target filesystem doesn't have requested /sbin/init.
BusyBox v1.30.1 (Ubuntu 1:1.30.1-4ubuntu6.4) multi-call binary.

Usage: run-init [-d CAP,CAP...] [-n] [-c CONSOLE_DEV] NEW_ROOT NEW_INIT [ARGS]

Free initramfs and switch to another root fs:
chroot to NEW_ROOT, delete all in /, move NEW_ROOT to /,
execute NEW_INIT. PID must be 1. NEW_ROOT must be a mountpoint.

	-c DEV	Reopen stdio to DEV after switch
	-d CAPS	Drop capabilities
	-n	Dry run
BusyBox v1.30.1 (Ubuntu 1:1.30.1-4ubuntu6.4) multi-call binary.

Usage: run-init [-d CAP,CAP...] [-n] [-c CONSOLE_DEV] NEW_ROOT NEW_INIT [ARGS]

Free initramfs and switch to another root fs:
chroot to NEW_ROOT, delete all in /, move NEW_ROOT to /,
execute NEW_INIT. PID must be 1. NEW_ROOT must be a mountpoint.

	-c DEV	Reopen stdio to DEV after switch
	-d CAPS	Drop capabilities
	-n	Dry run
BusyBox v1.30.1 (Ubuntu 1:1.30.1-4ubuntu6.4) multi-call binary.

Usage: run-init [-d CAP,CAP...] [-n] [-c CONSOLE_DEV] NEW_ROOT NEW_INIT [ARGS]

Free initramfs and switch to another root fs:
chroot to NEW_ROOT, delete all in /, move NEW_ROOT to /,
execute NEW_INIT. PID must be 1. NEW_ROOT must be a mountpoint.

	-c DEV	Reopen stdio to DEV after switch
	-d CAPS	Drop capabilities
	-n	Dry run
BusyBox v1.30.1 (Ubuntu 1:1.30.1-4ubuntu6.4) multi-call binary.

Usage: run-init [-d CAP,CAP...] [-n] [-c CONSOLE_DEV] NEW_ROOT NEW_INIT [ARGS]

Free initramfs and switch to another root fs:
chroot to NEW_ROOT, delete all in /, move NEW_ROOT to /,
execute NEW_INIT. PID must be 1. NEW_ROOT must be a mountpoint.

	-c DEV	Reopen stdio to DEV after switch
	-d CAPS	Drop capabilities
	-n	Dry run
BusyBox v1.30.1 (Ubuntu 1:1.30.1-4ubuntu6.4) multi-call binary.

Usage: run-init [-d CAP,CAP...] [-n] [-c CONSOLE_DEV] NEW_ROOT NEW_INIT [ARGS]

Free initramfs and switch to another root fs:
chroot to NEW_ROOT, delete all in /, move NEW_ROOT to /,
execute NEW_INIT. PID must be 1. NEW_ROOT must be a mountpoint.

	-c DEV	Reopen stdio to DEV after switch
	-d CAPS	Drop capabilities
	-n	Dry run
No init found. Try passing init= bootarg.


BusyBox v1.30.1 (Ubuntu 1:1.30.1-4ubuntu6.4) built-in shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs)