It depends.

If you are already subscribed to any plan, regardless of whether a valid promo code was already applied in the Settings > Account & Subscription page, while the subscription is active, you won't be able to apply a promo code while changing the subscription plan.

However, if you cancel the subscription from Settings or if the subscription is canceled automatically after the grace period from a failed credit card payment expired, you will be able to apply a promo code when you renew your subscription from the login page.

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