Shopify webhook settings
Troubleshoot Shopify webhook settings
If you notice that webhooks are not running and inventory is not syncing and Shopify sellers are experiencing oversells, and they have a duplicated account pls see this FAQ, specifically the bottom section.
https://support.omnivore.com.au/how-to-duplicate-an-omnivore-account
It outlines a change that was made to how webhooks run for accounts that are duplicated.