New payment not set up automatically when manually switching members subscriptions from dashboard.

I have several subscriptions with recurring monthly payments. I switched a member from "x" subscription to "y" subscription from dashboard and the payment for "x" was successfully cancelled on Stripe but the new payment for "y" wasn't set up automatically. So this user has access to "y" subscription without paying.
Right now in the user's profile it says "Payment Gateway: None (Admin)". How can I make the user to make recurring payments for "y" subscription?