Hello Steve Cerqua,
Neat Office is a third-party app, so its subscription is managed by the developer directly — not through Microsoft. It won't appear under Microsoft account subscriptions.
For cancellation, you will need to contact the Neat Office/WPS support team directly, as they handle all billing and subscription management on their end. Since the 14-day Microsoft Store refund window has already passed, the developer is the only path forward here.