Subscriptions not charging card on file

[Heartsonfiber]

I have a monthly subscription that customers can add a card on file. In the last few months, a customer has a card on file, but the subscription says it's not on file and won't charge the customer. 

Once the invoice is created, I can manually process the subscription with the card on file. When I try and edit the subscription for the customer, I can't choose a card on file, and the system wants me to put the card manually in. What am I doing wrong?

[JJ_]

Hey there @Heartsonfiber

Is this happening to a particular customer or is it happening to all of your subscriptions? 

[Heartsonfiber]

It happens when a customer needs to change their credit card. We add the new one to the account. The card is saved on file but doesn't transfer to the subscription. I can't select it when I edit the subscription, but I can run the payment manually once an invoice is created. I have to do this with many customers now.

[JJ_]

In this case, the Subscription creates a Requiring Invoice series. Whenever a customer needs to update their card on file you would need to visit the recurring invoice assigned to the specific customer and edit it so it charges a different card on file from now on.