My customers are not being charged automatically. What can I do?

First, check if you have a recurring invoices or auto-charging subscription rule configured in your shop. Customers can only start an auto-charging subscription if you have an auto-charging subscription rule configured in your shop.
Then, open Seal Subscriptions > Subscriptions and check the type of the subscriptions that are in your shop. You can either have auto-charging subscriptions or recurring invoice subscriptions. Only the auto-charging subscriptions will process the charges automatically. The recurring invoice subscriptions will only send your customers an email with a payment link, where they can pay for each recurring order.

To start accepting the auto-charging subscriptions, you have to create a new auto-charging subscription rule.
Any existing recurring invoices subscribers won't get charged automatically. Only new subscribers can activate the auto-charging feature.