Background Assets - Manifest Error

I'm successfully creating the AAR file on my system:

Manifest file:

{
	"assetPackID": "my-ba",
	"downloadPolicy": {
		"essential": { 
			"installationEventTypes": [
				"firstInstallation",
				"subsequentUpdate"
			]
		}
	},
	"fileSelectors": [
        {
            "file": "file1.bin"
        },
        {
            "file": "file2.bin"
        }
	],
	"platforms": [
		"iOS"
	]
}

Command:

xcrun /Applications/Xcode-beta.app/Contents/Developer/usr/bin/ba-package my-ba.json -o my-ba.aar

I'm using Transporter on my Sequoia 15.6 system - when I'm uploading the AAR file, I'm getting the following error:

ITMS-91140: Invalid manifest file. Invalid manifest file. Your asset pack’s manifest file can’t be verified. Make sure it follows the manifest template, then upload again.

Full Debug Log: