Sometimes you cannot update a WordPress or WooCommerce plugin via your backend using the auto update option. It happens. My advice: ignore it and update manually. Only if the issue persists and the lack of auto update is starting to annoy you multiple times, escalate to a support queue.

A manual update for a paid WooCommerce extension is done as follows.

Go to your WooCommerce account and download the extension.
Unpack the extension.
Upload via a FTP client.