Welcome to the Auth0 Community!
After some tests and looking closely at your app_metadata, I found that you need to set the hashes property as an object.
{
"hashes": {
"type": "client",
"hash": "9c6732f13bfe1dd9e743a7f7c637a96f4437364a77eb9699fa447a59b2643dd5",
"premium": false
}
}
Once you have made these changes, you can export your users app_metadata.hashes.client
without issues. I can confirm after testing on my side as well.
Please let me know if there’s anything else I can do to help.
Thank you.