problem not renewal

Good morning, i have a problem testing the free version of YITH WooCommerce Subscription for a customer.
I tried buying a daily subscription and it should automatically pay every day, creating a new order, but it doesn’t work.
The status of the order is “Active” but the expiration date is 20th December (the date of the first order).
I’m using the Sandbox of paypal, could this be causing the problem?

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