# Pastebin 0F0aDxGa
-- Set wget command. Note that wget is busybox wget because this needs
-- to run in initramfs.
# wgetCmd="wget --header 'X-aws-ec2-metadata-token: $TOKEN'"

# $wgetCmd -O "$metaDir/ami-manifest-path" $imds/meta-data/ami-manifest-path
wget: bad address 'TOKEN-REDACTED''

-- Okay, what did it try to run?
# echo $wgetCmd -O "$metaDir/ami-manifest-path" $imds/meta-data/ami-manifest-path
wget --header 'X-aws-ec2-metadata-token: TOKEN-REDACTED' -O ./ami-manifest-path http://169.254.169.254/2009-04-04/meta-data/ami-manifest-path

-- Let's paste that into the terminal. It works!
# wget --header 'X-aws-ec2-metadata-token: TOKEN-REDACTED' -O ./ami-manifest-path http://169.254.169.254/2009-04-04/meta-data/ami-manifest-path

-- Okay, what is the value of that variable?
# declare -p wgetCmd
declare -- wgetCmd="wget --header 'X-aws-ec2-metadata-token: AQAEAGj2do44xgblZt4YiC2TA7T0xpfRXYO32BeA5D7obSKrdoQXfA=='"