No worries! I think I’m with you now. It sounds like - if you’re watching for order changes - you’d be referring to GraphQL Webhook Subscriptions.
Taking a look at QueryRoot.webhookSubscription here the naming wouldn’t have changed. I’ve compared back to version 2020-10 of the GraphQL API - it’s remained the same.
Are you using Subscription instead of including the full name of WebhookSubscription when subscribing perhaps?